cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2220415-1
title: Field-tunable magnetic order and excitations in quantum spin liquid candidate NaYbSe2

description: NaYbCh2 (Ch = O, S, Se) does not form magnetic order down to 50mK in the presence of considerably strong antiferromagnetic interactions, and is suggested to exhibit a highly fluctuating QSL ground state. By comparing the structure of our magnetic excitation spectra with the theoretical expectation from the spinon continuum, we conclude that the ground state of NaYbSe2 is a QSL with a spinon Fermi surface. Moreover, our recent results of NaYbSe2 reveal a dispersive magnetic excitation continuum with clear upper and lower excitation edges under magnetic fields (up to 4 T). To further complete the measurements at a higher magnetic field region (up to 9 T), determine the accurate magnetic interactions, and corroborate the spinon Fermi surface picture, we propose to measure momentum-dependent low energy magnetic excitations under magnetic fields.
DOI: 10.5286/isis.e.rb2220510-1
title: Soft solid/crystalline composites

description: Metal organic frameworks (MOFs) are a particularly interesting class of three dimensional crystalline networks formed by the self-assembly of metal ions with organic ligands. Their regular structure creates internal pores and channels, and the large internal surface area this creates makes them interesting candidates for use in hydrogen storage, gas separation and drug delivery. A new area of research is the use of MOFs as a hard template to produce a negative image of the highly porous structure in a softer material such as a polymer. There have been several reports of the adsorption of monomers into MOFs and their subsequent polymerisation in situ, but physical characterisation of the MOF/monomer composite is somewhat lacking in the field. The proposed experiments will shed light on MOF/polymer interactions, and how these have changed from the pre-polymerised material.
DOI: 10.3535/tx6-c5h-vll
title: Bromus fasciculatus C.Presl

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/yxh-cdy-eg2
title: Wahlenbergia hederacea (L.) Rchb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220150-1
title: Neutron powder diffraction studies of magnetic order in non-centrosymmetric oxides Ni4Nb2O9

description: Among corundum niobates, Ni4Nb2O9 is the only compound that lacks the centre of symmetry in its crystal structure. Although previous work confirms that the Ni2+ ions occupy two different crystallographic sites, it fails to provide a clear understanding of the magnetic properties of this compound. The compound shows compensated magnetic moment followed by the magnetization reversal. Our x-ray diffraction and absorption spectroscopy indicate a mixed charge state in Nickel and the signature of charge ordering. To understand the exact role of two different Ni sites towards the magnetically ordered state, we propose to perform a neutron powder diffraction experiment down to 10 K. This will provide us with the magnetic structure and the origin of magnetization reversal. Additionally, it will help us to determine any structural anomaly associated with the charge ordering transition.
DOI: 10.5286/isis.e.rb2220510
title: Soft solid/crystalline composites

description: Metal organic frameworks (MOFs) are a particularly interesting class of three dimensional crystalline networks formed by the self-assembly of metal ions with organic ligands. Their regular structure creates internal pores and channels, and the large internal surface area this creates makes them interesting candidates for use in hydrogen storage, gas separation and drug delivery. A new area of research is the use of MOFs as a hard template to produce a negative image of the highly porous structure in a softer material such as a polymer. There have been several reports of the adsorption of monomers into MOFs and their subsequent polymerisation in situ, but physical characterisation of the MOF/monomer composite is somewhat lacking in the field. The proposed experiments will shed light on MOF/polymer interactions, and how these have changed from the pre-polymerised material.
DOI: 10.5286/isis.e.rb2220510-2
title: Soft solid/crystalline composites

description: Metal organic frameworks (MOFs) are a particularly interesting class of three dimensional crystalline networks formed by the self-assembly of metal ions with organic ligands. Their regular structure creates internal pores and channels, and the large internal surface area this creates makes them interesting candidates for use in hydrogen storage, gas separation and drug delivery. A new area of research is the use of MOFs as a hard template to produce a negative image of the highly porous structure in a softer material such as a polymer. There have been several reports of the adsorption of monomers into MOFs and their subsequent polymerisation in situ, but physical characterisation of the MOF/monomer composite is somewhat lacking in the field. The proposed experiments will shed light on MOF/polymer interactions, and how these have changed from the pre-polymerised material.
DOI: 10.3535/dgf-vhd-e2z
title: Cynosurus effusus Link

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/ycm-9jm-byg
title: Hypericum montanum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220150
title: Neutron powder diffraction studies of magnetic order in non-centrosymmetric oxides Ni4Nb2O9

description: Among corundum niobates, Ni4Nb2O9 is the only compound that lacks the centre of symmetry in its crystal structure. Although previous work confirms that the Ni2+ ions occupy two different crystallographic sites, it fails to provide a clear understanding of the magnetic properties of this compound. The compound shows compensated magnetic moment followed by the magnetization reversal. Our x-ray diffraction and absorption spectroscopy indicate a mixed charge state in Nickel and the signature of charge ordering. To understand the exact role of two different Ni sites towards the magnetically ordered state, we propose to perform a neutron powder diffraction experiment down to 10 K. This will provide us with the magnetic structure and the origin of magnetization reversal. Additionally, it will help us to determine any structural anomaly associated with the charge ordering transition.
DOI: 10.5286/isis.e.rb2220519
title: High Magnetic Frustration in a 2D Triangular Antiferromagnet

description: Magnetic materials that only have significant interactions in one or two dimensions give rise to exotic magnetic states, particularly where they contain competing magnetic interactions that cannot be simultaneously satisfied, which is referred to as magnetic frustration. Magnetic materials that combine inorganic and organic components are ideally suited to hosting well separated sheets and chains in their structures. Recent measurements by our group have shown that (NH3NH2)2CoCl4(H2O)2, in which the molecular complex forms 2D layers built from edge sharing isosceles triangles of Co cations, is highly magnetically frustrated. This experiment will establish the ordered magnetic state in this material, that emerges below 200 mK, and probe its local magnetic structure at temperatures up to 20 K, where its magnetic interactions are significant but frustration prevents magnetic ordering.
DOI: 10.5286/isis.e.rb2220519-1
title: High Magnetic Frustration in a 2D Triangular Antiferromagnet

description: Magnetic materials that only have significant interactions in one or two dimensions give rise to exotic magnetic states, particularly where they contain competing magnetic interactions that cannot be simultaneously satisfied, which is referred to as magnetic frustration. Magnetic materials that combine inorganic and organic components are ideally suited to hosting well separated sheets and chains in their structures. Recent measurements by our group have shown that (NH3NH2)2CoCl4(H2O)2, in which the molecular complex forms 2D layers built from edge sharing isosceles triangles of Co cations, is highly magnetically frustrated. This experiment will establish the ordered magnetic state in this material, that emerges below 200 mK, and probe its local magnetic structure at temperatures up to 20 K, where its magnetic interactions are significant but frustration prevents magnetic ordering.
DOI: 10.3535/34d-tka-7p4
title: Sisymbrium officinale (L.) Scop.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220431
title: Crystal and magnetic structures of the NdMnMnReO6 double double perovskite

description: Perovskites, ABO3, can be modified to induce cation orderings at A and B sites in double double perovskites AA’BB’O6 (DDPv). We have recently synthesised the first member of a new DDPv series, NdMnMnReO6. This is notable for having all four A/A’/B/B’ cations being magnetic – the first time that this has been achieved in DDPv’s. Magnetic susceptibility measurements reveal two magnetic transitions at TC1 = 233 K and TC2 = 69 K. The M-H hysteresis loop at 100 K shows a moment of ~4 BM/f.u. consistent with a simple up-Mn/down-Re spin ferrimagnetic order but M-H at 2 K has a much smaller ordered moment ~0.5 BM/f.u. revealing a more complex order. Neutron diffraction is needed to investigate the crystal structure (esp. any Nd/Mn or Mn/Re antisite disorders and accurate metal-oxygen distances for BVS calculations) and T-evolution of magnetic order. Hence 2 days on WISH are requested.
DOI: 10.5286/isis.e.rb2220431-1
title: Crystal and magnetic structures of the NdMnMnReO6 double double perovskite

description: Perovskites, ABO3, can be modified to induce cation orderings at A and B sites in double double perovskites AA’BB’O6 (DDPv). We have recently synthesised the first member of a new DDPv series, NdMnMnReO6. This is notable for having all four A/A’/B/B’ cations being magnetic – the first time that this has been achieved in DDPv’s. Magnetic susceptibility measurements reveal two magnetic transitions at TC1 = 233 K and TC2 = 69 K. The M-H hysteresis loop at 100 K shows a moment of ~4 BM/f.u. consistent with a simple up-Mn/down-Re spin ferrimagnetic order but M-H at 2 K has a much smaller ordered moment ~0.5 BM/f.u. revealing a more complex order. Neutron diffraction is needed to investigate the crystal structure (esp. any Nd/Mn or Mn/Re antisite disorders and accurate metal-oxygen distances for BVS calculations) and T-evolution of magnetic order. Hence 2 days on WISH are requested.
DOI: 10.3535/a43-ak9-jt9
title: Bupleurum gerardi All.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/qe0-j4j-nwd
title: Alnus alnobetula subsp. alnobetula

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220277-1
title: A candidate for a low-dimensional (or one-dimensional) f-electron Jahn-Teller system

description: Researchers were always fascinated to understand the interaction between phonons and localized electrons (especially 4f-electrons) since it affects several phenomena in connection with the cooperative Jahn-Teller effect (CJTE) and the consequent structural transitions. The physics of such systems becomes even more interesting when we realize such complex magneto elastic coupling in 1-dimensional system eg., PrCl3. In heat capacity of PrCl3, a single sharp peak is observed at 0.4K which is possibly associated with a structural transition arising from the CJTE distortion originating from orbital degeneracy. Under external magnetic field, the heat capacity shows unique features, and it looks like the system has coupled magneto-elastic properties. Therefore, here we are proposing neutron diffraction studies in milli-kelvin range using dilution fridge on powder and single crystalline PrCl3.
DOI: 10.5286/isis.e.rb2220677
title: Hunt for the Hidden Order in the Mn3Al2Ge3O12 Garnet

description: We seek to explore the nature of the spin-spin correlations in the manganese garnet Mn3Al2Ge3O12 by measuring the diffuse scattering signal at just above its Neel point. We have prepared and characterised a large single crystal of Mn3Al2Ge3O12, providing a unique chance to investigate the spin-spin correlations in detail and hunt for the multipolar "hidden order" of 10-spin loops previously found in Gd garnets Gd3Ga5O12 (GGG) and Gd3Al5O12 (GAG). The crystal structure of Mn3Al2Ge3O12 is identical to them with magnetic ions Mn2+ (L=0), rendering it the closest compound to the Gd garnets in its magnetic properties. The constituent magnetic Mn2+ is advantageous, as its neutron absorption is much lower than that of Gd. We propose to investigate the magnetic diffuse scattering of a phase pure single crystal sample of Mn3Al2Ge3O12 and its temperature dependence.
DOI: 10.5286/isis.e.rb2220677-1
title: Hunt for the Hidden Order in the Mn3Al2Ge3O12 Garnet

description: We seek to explore the nature of the spin-spin correlations in the manganese garnet Mn3Al2Ge3O12 by measuring the diffuse scattering signal at just above its Neel point. We have prepared and characterised a large single crystal of Mn3Al2Ge3O12, providing a unique chance to investigate the spin-spin correlations in detail and hunt for the multipolar "hidden order" of 10-spin loops previously found in Gd garnets Gd3Ga5O12 (GGG) and Gd3Al5O12 (GAG). The crystal structure of Mn3Al2Ge3O12 is identical to them with magnetic ions Mn2+ (L=0), rendering it the closest compound to the Gd garnets in its magnetic properties. The constituent magnetic Mn2+ is advantageous, as its neutron absorption is much lower than that of Gd. We propose to investigate the magnetic diffuse scattering of a phase pure single crystal sample of Mn3Al2Ge3O12 and its temperature dependence.
DOI: 10.3535/lpa-mgx-cda
title: Prunus spinosa L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/qfg-ga0-0lw
title: Aristolochia parvifolia Sm.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220277
title: A candidate for a low-dimensional (or one-dimensional) f-electron Jahn-Teller system

description: Researchers were always fascinated to understand the interaction between phonons and localized electrons (especially 4f-electrons) since it affects several phenomena in connection with the cooperative Jahn-Teller effect (CJTE) and the consequent structural transitions. The physics of such systems becomes even more interesting when we realize such complex magneto elastic coupling in 1-dimensional system eg., PrCl3. In heat capacity of PrCl3, a single sharp peak is observed at 0.4K which is possibly associated with a structural transition arising from the CJTE distortion originating from orbital degeneracy. Under external magnetic field, the heat capacity shows unique features, and it looks like the system has coupled magneto-elastic properties. Therefore, here we are proposing neutron diffraction studies in milli-kelvin range using dilution fridge on powder and single crystalline PrCl3.
DOI: 10.5286/isis.e.rb2220787
title: Using spin-echo SANS to study micrometer-scale PMMA latexes

description: Sterically-stabilised PMMA latexes in nonpolar solvents are an excellent model spherical colloid used in numerous studies in colloid science. There is limited long length scale, small-angle neutron scattering (SANS) data of these latexes, and none on the micrometer sized colloids that are frequently used. This experiment will use the spin-echo SANS (SESANS) technique to measure the scattering from a well-characterised dispersion of PMMA latexes in dodecane to establish optimal measurement conditions.
DOI: 10.5286/isis.e.rb2220787-1
title: Using spin-echo SANS to study micrometer-scale PMMA latexes

description: Sterically-stabilised PMMA latexes in nonpolar solvents are an excellent model spherical colloid used in numerous studies in colloid science. There is limited long length scale, small-angle neutron scattering (SANS) data of these latexes, and none on the micrometer sized colloids that are frequently used. This experiment will use the spin-echo SANS (SESANS) technique to measure the scattering from a well-characterised dispersion of PMMA latexes in dodecane to establish optimal measurement conditions.
DOI: 10.3535/hkt-erc-rpv
title: Hedypnois rhagadioloides (L.) F. W. Schmidt

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/ltl-0ja-rqt
title: Quercus ithaburensis subsp. macrolepis (Kotschy) Hedge & Yalt.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220551
title: Probing magnetic structures in doped honeycomb-like multiferroic, Mn2Mo3O8 and MnAMo3O8

description: Multiferroics exhibit order of both electronic and magnetic properties of a material. Coupling between the two (magnetoelectrics), means one of the properties can be controlled by manipulating the other (and vice versa). This leads to potential applications in electronics such as memory devices. However, in order to move towards it is essential to understand how these properties arise. We have prepared a series of multiferroic materials based on the general formulae MnAMo3O8 (A = Mn, Zn, Fe and Co). This materials are composed of alternating honeycomb-like Mn/A-O layers (with tetrahedra and octahedra) and trimerized Mo3O13 sheets stacked along the lattice c-direction. The aim of this proposal is to investigate the magnetic behaviour of Mn2Mo3O8 and the doped analogues to provide insight into the magnetic structure and the role of order across the two different magnetic sites.
DOI: 10.5286/isis.e.rb2220551-1
title: Probing magnetic structures in doped honeycomb-like multiferroic, Mn2Mo3O8 and MnAMo3O8

description: Multiferroics exhibit order of both electronic and magnetic properties of a material. Coupling between the two (magnetoelectrics), means one of the properties can be controlled by manipulating the other (and vice versa). This leads to potential applications in electronics such as memory devices. However, in order to move towards it is essential to understand how these properties arise. We have prepared a series of multiferroic materials based on the general formulae MnAMo3O8 (A = Mn, Zn, Fe and Co). This materials are composed of alternating honeycomb-like Mn/A-O layers (with tetrahedra and octahedra) and trimerized Mo3O13 sheets stacked along the lattice c-direction. The aim of this proposal is to investigate the magnetic behaviour of Mn2Mo3O8 and the doped analogues to provide insight into the magnetic structure and the role of order across the two different magnetic sites.
DOI: 10.3535/map-k8c-49n
title: Artemisia campestris subsp. lednicensis (Spreng.) Greuter & Raab-Straube

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210318
title: 4D Bragg Edge CT on Directional Ice Templated Na-Ion positive Electrodes

description: In recent years, the demand for low carbon energy storage in the transport and grid sectors has driven a global research effort in the development and optimisation of battery systems. Na-ion technology, such as Na1-x(Ni0.5Mn0.5)O2 (NNM) are regarded as one of the best near-term candidates for cathodes due to their high practical capacity &gt;150 mAh g-1 and lower cost, in comparison to Li-ion technology.Investigation of the de-/sodiation processes by standard imaging tools, such as X-ray or neutron CT, has no success due to the low attenuation of Na. Diffraction imaging techniques overcomes this problem and supply additional structural information of crystallographic changes. We propose a Bragg Edge CT experiment on ice templated NNM electrodes at different states of charge. The study will provide valuable information about sodiation paths and help to develop this imaging techniques.
DOI: 10.5286/isis.e.rb2210318-1
title: 4D Bragg Edge CT on Directional Ice Templated Na-Ion positive Electrodes

description: In recent years, the demand for low carbon energy storage in the transport and grid sectors has driven a global research effort in the development and optimisation of battery systems. Na-ion technology, such as Na1-x(Ni0.5Mn0.5)O2 (NNM) are regarded as one of the best near-term candidates for cathodes due to their high practical capacity &gt;150 mAh g-1 and lower cost, in comparison to Li-ion technology.Investigation of the de-/sodiation processes by standard imaging tools, such as X-ray or neutron CT, has no success due to the low attenuation of Na. Diffraction imaging techniques overcomes this problem and supply additional structural information of crystallographic changes. We propose a Bragg Edge CT experiment on ice templated NNM electrodes at different states of charge. The study will provide valuable information about sodiation paths and help to develop this imaging techniques.
DOI: 10.5286/isis.e.rb2220248-1
title: Strange metal behaviour and spin fluctuations in overdoped La2-xSrxCuO4

description: Above their transition temperature Tc, cuprate superconductors are metals. However, the conduction electrons show very anomalous behavior compared to other metals. E.g. the resistivity is proportion to temperature (T). We believe that this "strange" behavior is connected to spin fluctuations with energies comparable to T. These spin fluctuations may scatter the conduction electrons and change (scale) in a special way with T and be connected to strange T-dependence of the resistivity. We have recently identified very low-energy (~4 meV) overdamped spin fluctuations in normal state of La2-xSrxCuO4 (x=0.22) for T close to Tc. Here we propose to measure how these excitations change with T We will compare our results to theories of magnetic quantum criticality. The results will shed light on the nature of electrons which carry charge in the cuprates.
DOI: 10.3535/frz-1qv-evj
title: Crepis L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/zft-tkn-stx
title: Geum montanum L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2210289-2
title: Probing the change in the structure of an ionic liquid upon a liquid-liquid transition

description: Crystalline solids are characterised by high ordering at a microscopic level, forming a crystal lattice. It is common for a crystalline material to occur at different crystalline forms, with different lattices (polymorphism). In liquids, molecules are disordered, albeit strongly interacting, and are able to move freely with respect to one another. Although some elements and metal oxides have more than one liquid structure, displaying high-temperature liquid-liquid transitions (LLTs), only a handful of room-temperature liquids display LLTs. Recently, an entire family of ionic liquids (salts that are liquid around room temperature) have been reported to display LLTs below ambient temperature. This study aims to uncover, for the first time, how molecules of ionic liquids rearrange themselves upon such transition, and how this phenomenon could be used to design new functional liquids.