cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2310327
title: Neutron powder diffraction study of magnetic order in geometrically frustrated triangular lattice: CeAuAl4Ge2

description: Recently the compounds with geometrically frustrated crystal structure have attracted considerable attention due to frustration induced quantum spin-liquid ground state. CeAuAl4Ge2, which crystallizes in a triangular lattice (rhombohedral, space group R-3m) structure, is reported to exhibit a phase transition near 1.4 K in heat capacity and electrical resistivity. The entropy is found to be only 52% of Rln2 near the transition temperature, but Rln2 at 15 K, indicating a presence of short-range ordering above 1.4 K. Initial interpretation for this phase transition is a magnetic ordering of an antiferromagnetic character. The Kondo hybridization as inferred from the electrical resistivity is almost negligible. In the rhombohedral structure of CeAuAl4Ge2, the Ce-moments form the equilateral triangle arrangement and hence are subject to geometrical frustration and could stabilize complex magnetic structure. Further investigations using neutron diffraction measurements are highly desired to determine the magnetic structure of this compound and the presence of short-range magnetic correlations above TN=1.4 K. We propose to carry out neutron powder diffraction measurements on CeAuAl4Ge2 using the WISH diffractometer to determine the magnetic structure of this geometrically frustrated compound and short-range correlations present above the phase transition as evident from the magnetic entropy.
DOI: 10.5286/isis.e.rb2310327-1
title: Neutron powder diffraction study of magnetic order in geometrically frustrated triangular lattice: CeAuAl4Ge2

description: Recently the compounds with geometrically frustrated crystal structure have attracted considerable attention due to frustration induced quantum spin-liquid ground state. CeAuAl4Ge2, which crystallizes in a triangular lattice (rhombohedral, space group R-3m) structure, is reported to exhibit a phase transition near 1.4 K in heat capacity and electrical resistivity. The entropy is found to be only 52% of Rln2 near the transition temperature, but Rln2 at 15 K, indicating a presence of short-range ordering above 1.4 K. Initial interpretation for this phase transition is a magnetic ordering of an antiferromagnetic character. The Kondo hybridization as inferred from the electrical resistivity is almost negligible. In the rhombohedral structure of CeAuAl4Ge2, the Ce-moments form the equilateral triangle arrangement and hence are subject to geometrical frustration and could stabilize complex magnetic structure. Further investigations using neutron diffraction measurements are highly desired to determine the magnetic structure of this compound and the presence of short-range magnetic correlations above TN=1.4 K. We propose to carry out neutron powder diffraction measurements on CeAuAl4Ge2 using the WISH diffractometer to determine the magnetic structure of this geometrically frustrated compound and short-range correlations present above the phase transition as evident from the magnetic entropy.
DOI: 10.5286/isis.e.rb2369004
title: Understanding the structure of novel RNA-Lipid nanoparticles using SANS

description: The recent Covid-19 pandemic has shown both the efficacy and need to develop effective vaccines and drug delivery. One technology which has been very effective at this uses lipid nanoparticles. These are small particles in which the lipid layer allows us to target the immune system. The nanoparticles are used to deliver a dose of mRNA. The exact dose held depends upon the encapsulation properties of the nanoparticle. We propose using SANS to look at the properties of a novel lipid nanoparticle system to determine how this system is able to encpsulate a high degree of mRNA and also remain very stable over a long period of time, contrary to other systems which require freezing.
DOI: 10.3535/xrq-qed-895
title: Hydrocotyle poeppigii DC.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310226
title: Nucleation and crystal growth from amorphous to crystalline ice

description: Amorphous ice has a non-periodic structure distinct from crystalline phases. It is still challenging to elucidate its physicochemical features explicitly. In this project, we investigate the transient states, nucleation and growth of crystalline ice from amorphous form. Local structures derived from total scattering analysis can provide direct information on the evolusion of atomic alignment from non-periodic structure via nano-crystalline seeds to macrocrystalline ice. Furthermore, this experiment will examine the so-called relaxation within the amorphous structure before crystallisation.
DOI: 10.5286/isis.e.rb2330513
title: Vesuvio new backscattering setup calibration
DOI: 10.5286/isis.e.rb2330513-2
title: Vesuvio new backscattering setup calibration
DOI: 10.3535/d3k-0eq-0tf
title: Verrucaria

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/dlk-jhc-as2
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2269100-1
title: Controlling self-assembly process to tune properties of nano-carriers for drug delivery
DOI: 10.5286/isis.e.rb2310209
title: Topochemical Cation Exchange Reactions of Layered Perovskite Oxides

description: Magnetoelectric materials exhibit coupled ferromagnetic and ferroelectric behaviour and are predicted to have a broad range of applications in electronic data storage and manipulation. We have adopted a strategy of using low-temperature cation-exchange reactions to substitute paramagnetic ions into hybrid-improper ferroelectric phases as a route towards magnetoelectric materials. Following this approach we have prepared FeCaTa2O7, CoCaTa2O7 and ZnCaTa2O7. We propose to collect neutron powder diffraction data from these phases at room temperature to establish their crystal structures, and then on cooling (FeCaTa2O7, and CoCaTa2O7 only) to establish their magnetic structures and to see if the onset of magnetic order induces the phases to adopt polar crystal structures. These data will be compared to previous data collected on WISH from the related phases, MnSrTa2O7 - which is polar and exhibits magnetoelectric coupling, and MnCaTa2O7 - which is polar but does not exhibit magnetoelectric coupling.
DOI: 10.5286/isis.e.rb2310209-1
title: Topochemical Cation Exchange Reactions of Layered Perovskite Oxides

description: Magnetoelectric materials exhibit coupled ferromagnetic and ferroelectric behaviour and are predicted to have a broad range of applications in electronic data storage and manipulation. We have adopted a strategy of using low-temperature cation-exchange reactions to substitute paramagnetic ions into hybrid-improper ferroelectric phases as a route towards magnetoelectric materials. Following this approach we have prepared FeCaTa2O7, CoCaTa2O7 and ZnCaTa2O7. We propose to collect neutron powder diffraction data from these phases at room temperature to establish their crystal structures, and then on cooling (FeCaTa2O7, and CoCaTa2O7 only) to establish their magnetic structures and to see if the onset of magnetic order induces the phases to adopt polar crystal structures. These data will be compared to previous data collected on WISH from the related phases, MnSrTa2O7 - which is polar and exhibits magnetoelectric coupling, and MnCaTa2O7 - which is polar but does not exhibit magnetoelectric coupling.
DOI: 10.3535/9xf-p9s-xc0
title: Muehlenbeckia tamnifolia (Kunth) Meisn.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2269100
title: Controlling self-assembly process to tune properties of nano-carriers for drug delivery
DOI: 10.5286/isis.e.rb2310457
title: Understanding the conformation of cellulose in aqueous and organic media

description: The conformation of cellulose derivatives in solution is known to be strongly dependent on solvent type, but there are no systematic studies on how solvent type affects the conformation of cellulose ethers. Here we seek to understand how the solvent properties such as dielectric constant or hydrogen-bonding capacity influence the local conformation of carboxymethyl cellulose (CMC), a polyelectrolyte with wide applications in industrial formulations. We use the tetrabutyl ammonium salt of CMC (TBACMC) to make the polymer soluble in various organic solvent. Deuterated counterions will be used to contrast match their scattering signal, so that the polymer conformation can be measured directly. The proposal will produce a comprehensive dataset that will allow us to understand how cellulose conformation depends on solvent media.
DOI: 10.5286/isis.e.rb2310457-1
title: Understanding the conformation of cellulose in aqueous and organic media

description: The conformation of cellulose derivatives in solution is known to be strongly dependent on solvent type, but there are no systematic studies on how solvent type affects the conformation of cellulose ethers. Here we seek to understand how the solvent properties such as dielectric constant or hydrogen-bonding capacity influence the local conformation of carboxymethyl cellulose (CMC), a polyelectrolyte with wide applications in industrial formulations. We use the tetrabutyl ammonium salt of CMC (TBACMC) to make the polymer soluble in various organic solvent. Deuterated counterions will be used to contrast match their scattering signal, so that the polymer conformation can be measured directly. The proposal will produce a comprehensive dataset that will allow us to understand how cellulose conformation depends on solvent media.
DOI: 10.3535/me3-4tg-pvj
title: Coriaria ruscifolia L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/we2-gv4-pmt
title: Dichapetalum petaloideum Breteler

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310265
title: Field-dependent magnon dispersions in topological magnet

description: Recently, the first f-electron skyrmions were reported in three centrosymmetric Gd-based materials including Gd2PdSi3. In contrast to the well known skyrmion materials like MnSi, these f-electron skyrmions do not require inversion symmetry breaking. While the competition of frustrated RKKY exchange, anisotropy or four-spin interactions has been proposed as the driving mechanism behind skyrmion stabilization, a detailed microscopic understanding of the underlying spin interactions has remained elusive, and is a key ingredient to designing centrosymmetric skyrmion materials. Neutron spectroscopy is typically the ideal probe for such investigations, however, the significant neutron absorption of Gd has largely prevented this. We identified the centrosymmetric tetragonal heavy-fermion magnet CeAgBi2 as another f-electron material that hosts skyrmion-lattice order. In our recent neutron diffraction study, we gained conclusive evidence for multiple skyrmion-lattice phases, which coincide with a huge topological Hall effect. We have successfully explored the magnon dispersion in zero-field and now propose to gain insight into the field-dependence within the topologically non-trivial phases. In turn, we will determine the underlying interaction mechanisms that underlie the emergence of skyrmions in CeAgBi2. Our study is of general importance with regard to our understanding of magnetically frustrated f-electron systems as well as topologically non-trivial spin textures.
DOI: 10.5286/isis.e.rb2310265-1
title: Field-dependent magnon dispersions in topological magnet

description: Recently, the first f-electron skyrmions were reported in three centrosymmetric Gd-based materials including Gd2PdSi3. In contrast to the well known skyrmion materials like MnSi, these f-electron skyrmions do not require inversion symmetry breaking. While the competition of frustrated RKKY exchange, anisotropy or four-spin interactions has been proposed as the driving mechanism behind skyrmion stabilization, a detailed microscopic understanding of the underlying spin interactions has remained elusive, and is a key ingredient to designing centrosymmetric skyrmion materials. Neutron spectroscopy is typically the ideal probe for such investigations, however, the significant neutron absorption of Gd has largely prevented this. We identified the centrosymmetric tetragonal heavy-fermion magnet CeAgBi2 as another f-electron material that hosts skyrmion-lattice order. In our recent neutron diffraction study, we gained conclusive evidence for multiple skyrmion-lattice phases, which coincide with a huge topological Hall effect. We have successfully explored the magnon dispersion in zero-field and now propose to gain insight into the field-dependence within the topologically non-trivial phases. In turn, we will determine the underlying interaction mechanisms that underlie the emergence of skyrmions in CeAgBi2. Our study is of general importance with regard to our understanding of magnetically frustrated f-electron systems as well as topologically non-trivial spin textures.
DOI: 10.3535/0ms-nxg-0lr
title: Lactuca perennis L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/bez-73v-1sb
title: Sarmienta scandens (Brandis) Pers.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310115-1
title: Unravelling LNP endosomal escape

description: LNP are versatile drug and gene delivery particles. Examples of successful LNP formulation are the Comirnaty and mRNA-1273 Covid19 vaccines. Even though these are successful, cellular internalisation remains to be the man limiting factor on their therapeutic efficiency forcing high concentration doses with unwanted side effects. In-depth investigations using endosomal membrane mimics are limited due to the constrains of these systems. To meet this need, we developed an assay that monitors single LNP binding events to a supported lipid bilayer (SLB) designed to mimic the endosomal membrane. The SLB is formed on top of a nanoporous substrate that creates edges and compartments that facilitate molecular incorporation beneath the SLB. Neutron reflection will be used to demonstrate that the cationic lipid in LNP fuse with the membrane and that the cargo is delivered beneath the membrane.
DOI: 10.5286/isis.e.rb2310240
title: Thermal evolution of magnetic and crystal structures of quaternary perovskites Ba4MRu3O12 (M = Li, Na, Mg, Zn)

description: Orbital molecules represent a quantum state where directly bonded clusters of orbitally ordered atoms are formed. They are often found in systems hosting dimers/trimers and we propose to investigate a class of such materials: Ba4MRu3O12 (M=Li, Na, Mg, Zn). The physics here is dictated by the interaction within, and between Ru2O9 dimers and RuO6 octahedra, which make up the magnetic (and electronic) building blocks of these inherently frustrated systems. We have synthesized a few of these yet un-investigated systems and found that their phase diagram shows a cascade of phase transitions as a function of temperature. Investigation of these systems using neutron powder diffraction will provide crucial information on the temperature dependent evolution of their crystal and magnetic structures, as well as the driving mechanisms behind the observed transitions.
DOI: 10.5286/isis.e.rb2310240-1
title: Thermal evolution of magnetic and crystal structures of quaternary perovskites Ba4MRu3O12 (M = Li, Na, Mg, Zn)

description: Orbital molecules represent a quantum state where directly bonded clusters of orbitally ordered atoms are formed. They are often found in systems hosting dimers/trimers and we propose to investigate a class of such materials: Ba4MRu3O12 (M=Li, Na, Mg, Zn). The physics here is dictated by the interaction within, and between Ru2O9 dimers and RuO6 octahedra, which make up the magnetic (and electronic) building blocks of these inherently frustrated systems. We have synthesized a few of these yet un-investigated systems and found that their phase diagram shows a cascade of phase transitions as a function of temperature. Investigation of these systems using neutron powder diffraction will provide crucial information on the temperature dependent evolution of their crystal and magnetic structures, as well as the driving mechanisms behind the observed transitions.
DOI: 10.3535/7dd-16w-xqm
title: Bikinia media Wieringa

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/w8s-jdy-c04
title: Moehringia trinervia (L.) Clairv.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310094
title: Additional tests of the DREAM bi-spectral switch

description: This is a continuation of proposal 2210085 "Performance test of the DREAM bi-spectral switch". The first measurements were carried out in July 2022 at IMAT beamline.
DOI: 10.5286/isis.e.rb2310094-1
title: Additional tests of the DREAM bi-spectral switch

description: This is a continuation of proposal 2210085 "Performance test of the DREAM bi-spectral switch". The first measurements were carried out in July 2022 at IMAT beamline.
DOI: 10.5286/isis.e.rb2310115
title: Unravelling LNP endosomal escape

description: LNP are versatile drug and gene delivery particles. Examples of successful LNP formulation are the Comirnaty and mRNA-1273 Covid19 vaccines. Even though these are successful, cellular internalisation remains to be the man limiting factor on their therapeutic efficiency forcing high concentration doses with unwanted side effects. In-depth investigations using endosomal membrane mimics are limited due to the constrains of these systems. To meet this need, we developed an assay that monitors single LNP binding events to a supported lipid bilayer (SLB) designed to mimic the endosomal membrane. The SLB is formed on top of a nanoporous substrate that creates edges and compartments that facilitate molecular incorporation beneath the SLB. Neutron reflection will be used to demonstrate that the cationic lipid in LNP fuse with the membrane and that the cargo is delivered beneath the membrane.
DOI: 10.3535/475-8r0-y9q
title: Jacobaea subalpina (W. D. J. Koch) Pelser & Veldkamp

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/9hs-48p-v80
title: Clematicissus striata subsp. striata

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220435
title: Investigation of Cryogenic Residual Stress Relief on Stainless Steels
DOI: 10.5286/isis.e.rb2220435-1
title: Investigation of Cryogenic Residual Stress Relief on Stainless Steels
DOI: 10.5286/isis.e.rb2291041-1
title: Structure Elucidation of Novel High Power Li ion battery anodes
DOI: 10.3535/1gz-4kg-2qd
title: Sisyrinchium graminifolium Lindl.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/s81-blq-f0s
title: Cassia L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2291046-1
title: Ti vacancies and O vacancies in La- and Mg-doped BaTiO3
DOI: 10.5286/isis.e.rb2390000
title: Testing the qualities of HOPG crystals
DOI: 10.5286/isis.e.rb2390000-1
title: Testing the qualities of HOPG crystals
DOI: 10.3535/ave-r8k-ct7
title: Boquila trifoliolata (DC.) Decne.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/r1j-6qv-pbf
title: Alstroemeria ligtu L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220367-1
title: Crystalline-electric-field excitations and single-ion anisotropy of TbV6Sn6
DOI: 10.5286/isis.e.rb2310728
title: Spin-echo SANS grating standard measurement and analysis.

description: As part of the ongoing development and standardisation of SESANS instrumentation and data analysis methods the community is continuing to explore new calibration standards. The acquisition of 2 new bespoke silicon gratings will allow more robust calibration of Larmor at shorter spin-echo lengths and the development of more robust models for the observed scattering. The data will then be compared with subsequent measurements carried out at TU-Delft. In addition, the possibility of rotating the gratings to reduce the effective period will be explored as a method of further increasing the accuracy of the calibration at very short spin-echo lengths comparable with those observed in (V)SANS. It is likely that a new model will be required to accurately describe this data. This will be investigated by comparison with existing descriptions based on the phase object approximation and dynamical theory.
DOI: 10.5286/isis.e.rb2310728-1
title: Spin-echo SANS grating standard measurement and analysis.

description: As part of the ongoing development and standardisation of SESANS instrumentation and data analysis methods the community is continuing to explore new calibration standards. The acquisition of 2 new bespoke silicon gratings will allow more robust calibration of Larmor at shorter spin-echo lengths and the development of more robust models for the observed scattering. The data will then be compared with subsequent measurements carried out at TU-Delft. In addition, the possibility of rotating the gratings to reduce the effective period will be explored as a method of further increasing the accuracy of the calibration at very short spin-echo lengths comparable with those observed in (V)SANS. It is likely that a new model will be required to accurately describe this data. This will be investigated by comparison with existing descriptions based on the phase object approximation and dynamical theory.
DOI: 10.3535/0m2-v36-kyd
title: Mutisia spinosa var. pulchella (Speg.) Cabrera

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/74n-zmx-cgl
title: Hydrangea serratifolia (Hook. & Arn.) F. Phil.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220367
title: Crystalline-electric-field excitations and single-ion anisotropy of TbV6Sn6
DOI: 10.5286/isis.e.rb2220708
title: Study of crystalline-electric-field excitations of Kondo lattice Ce2NiSi3
DOI: 10.5286/isis.e.rb2220708-1
title: Study of crystalline-electric-field excitations of Kondo lattice Ce2NiSi3
DOI: 10.3535/00k-mz7-a5d
title: Floribundaria pseudofloribunda M. Fleisch.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2200312
title: Magnetic Properties of Quaternary Selenides

description: We will investigate magnetic ordering in Cu2MGeSe4 (M = Mn, Fe, Co), for which magnetic susceptibility data indicate a transition to antiferromagnetic order at temperatures in the range 10–20 K. The Mn- and Co-containing phases exhibit Curie-Weiss behaviour at high temperatures with effective magnetic moments in good agreement with spin-only values. The Fe analogue exhibits more complex behaviour with a second feature observed in the susceptibility below TN and a broad maximum in the high-temperature susceptibility, leading to non-Curie-Weiss behaviour. We seek to determine the magnetic structure for each phase, and its evolution with temperature, by collection of data at base temperature and on warming through TN. We will extend the collections to higher temperature for the Fe analogue to understand the origin of the different behaviour exhibited by this phase.