cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e/isis.e.rb2410430-1
title: Crystal field excitations in a novel quantum spin liquid candidate

description: We propose to study the crystal field excitations in the quantum spin liquid candidate Na2BaCo(PO4)2. Here the material exhibits a number of interesting properties including the lack of magnetic orders yet a large magnetic entropy at low temperature, as well as strong low energy spin fluctuations resembling that of a spin-continuum, making this a potential candidate for a quantum spin liquid system. Nevertheless, the lack of an effective theoretical model makes it difficult to quantitatively describe the spin excitation spectrum measured by inelastic neutron scattering. We plan to carry out a mean-field and multilevel spin-orbit exciton calculation to model the spin system. For this purpose we would like to measure the crystal field excitations using single crystal Na2BaCo(PO4)2 samples to understand the crystal field contribution, which will be important in our model calculation.
DOI: 10.3535/bgy-dr2-9vf
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2410430
title: Crystal field excitations in a novel quantum spin liquid candidate

description: We propose to study the crystal field excitations in the quantum spin liquid candidate Na2BaCo(PO4)2. Here the material exhibits a number of interesting properties including the lack of magnetic orders yet a large magnetic entropy at low temperature, as well as strong low energy spin fluctuations resembling that of a spin-continuum, making this a potential candidate for a quantum spin liquid system. Nevertheless, the lack of an effective theoretical model makes it difficult to quantitatively describe the spin excitation spectrum measured by inelastic neutron scattering. We plan to carry out a mean-field and multilevel spin-orbit exciton calculation to model the spin system. For this purpose we would like to measure the crystal field excitations using single crystal Na2BaCo(PO4)2 samples to understand the crystal field contribution, which will be important in our model calculation.
DOI: 10.5286/isis.e/isis.e.rb2410705
title: Investigation of crystal field excitations of 1D heavy-fermion compounds YbFe5P3 and Yb2Fe12P7

description: A growing number of quantum material, whose collective quantum mechanical properties give rise to exotic quantum states, have well-defined fractional sets of quasi-particles; for instance, a “spinon” is a quasi-particle that carries spin-1/2, but no charge. There is great interest in understanding the nature of the ground state and low-energy excitations of quantum materials that possess fractional quantum statistics. Recently, some of us investigated Yb based quasi-1D materials YbFe5P3 and Yb2Fe12P7, which exhibit interesting properties. In both cases, the heat capacity shows a clear heavy-fermion behaviour. Further, YbFe5P3 does not order magnetically down to 0.08 K, while Yb2Fe12P7 shows magnetic ordering at 1 K. Therefore, the determination of the true nature of the ground state of these 1D quantum magnets by measuring the crystal field excitations (CEF) is particularly important. We, therefore, propose here to investigate CEF energy level schemes and their wave functions using inelastic neutron scattering study on the MERLIN spectrometer of these two materials.
DOI: 10.5286/isis.e/isis.e.rb2410705-1
title: Investigation of crystal field excitations of 1D heavy-fermion compounds YbFe5P3 and Yb2Fe12P7

description: A growing number of quantum material, whose collective quantum mechanical properties give rise to exotic quantum states, have well-defined fractional sets of quasi-particles; for instance, a “spinon” is a quasi-particle that carries spin-1/2, but no charge. There is great interest in understanding the nature of the ground state and low-energy excitations of quantum materials that possess fractional quantum statistics. Recently, some of us investigated Yb based quasi-1D materials YbFe5P3 and Yb2Fe12P7, which exhibit interesting properties. In both cases, the heat capacity shows a clear heavy-fermion behaviour. Further, YbFe5P3 does not order magnetically down to 0.08 K, while Yb2Fe12P7 shows magnetic ordering at 1 K. Therefore, the determination of the true nature of the ground state of these 1D quantum magnets by measuring the crystal field excitations (CEF) is particularly important. We, therefore, propose here to investigate CEF energy level schemes and their wave functions using inelastic neutron scattering study on the MERLIN spectrometer of these two materials.
DOI: 10.3535/bxg-t0b-alc
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/vsa-q5s-sap
title: Centaurea cassia Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2420226
title: Effect of a biopolymer on the electrochromic performance of water soluble naphthalene diimides

description: Amino acid appended naphthalene diimides (NDIs) undergo a reversible colourless-to-dark transition following reduction and are therefore suitable candidates for use in electrochromic devices. To fabricate these devices, it is necessary to employ a polymer additive to improve robustness and flexibility. Hyaluronic acid (HA) is an ideal polymer for our purposes due to its high degree of water solubility, allowing for the construction of films without the use of organic solvents. It is important to investigate how the addition of HA to our systems influences the self-assembly of the NDI, and therefore its electrochromic properties, to allow us to choose suitable processing formulations when fabricating electrochromic devices. When a higher concentration of HA is added, there is a change in the molecular packing and oxidation times of the resulting films. We expect that the polymer is changing the self-assembly of the NDIs. Therefore, we hope to probe the effects of increasing polymer concentrations on the structures formed by the NDIs to understand these observations and give us the best performance in our devices.
DOI: 10.5286/isis.e/isis.e.rb2420226-1
title: Effect of a biopolymer on the electrochromic performance of water soluble naphthalene diimides

description: Amino acid appended naphthalene diimides (NDIs) undergo a reversible colourless-to-dark transition following reduction and are therefore suitable candidates for use in electrochromic devices. To fabricate these devices, it is necessary to employ a polymer additive to improve robustness and flexibility. Hyaluronic acid (HA) is an ideal polymer for our purposes due to its high degree of water solubility, allowing for the construction of films without the use of organic solvents. It is important to investigate how the addition of HA to our systems influences the self-assembly of the NDI, and therefore its electrochromic properties, to allow us to choose suitable processing formulations when fabricating electrochromic devices. When a higher concentration of HA is added, there is a change in the molecular packing and oxidation times of the resulting films. We expect that the polymer is changing the self-assembly of the NDIs. Therefore, we hope to probe the effects of increasing polymer concentrations on the structures formed by the NDIs to understand these observations and give us the best performance in our devices.
DOI: 10.5286/isis.e/isis.e.rb2490185-1
title: Axial observations of ice VI
DOI: 10.3535/0hm-pvh-8e6
title: Vitis gmelinii Buttler

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/pwt-v5j-60q
title: Galium L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2300033-1
title: Effect of deuteration on lipid monolayer phase behaviour as a function of temperature

description: A biological cell membrane is based on a bilayer of lipid molecules, which form a selective barrier in which functional molecules are embedded. The nature of the lipid constituents is important for the action of these molecules and our research aims to link lipid structure with the properties of the monolayers and bilayers they form. Studies of model systems often employ isotopic labelling to separate signals from different constituents in the model. Deuterium labelling is used in spectroscopic and neutron studies on the assumption that the chemical and physical behaviour of the molecules is unchanged. In this study, we propose to determine the conditions in which the assumption is valid and those in which it is not, using x-rays (which are insensitive to isotopic substitution) as the probe to compare structure of deuterated and undeuterated lipid monolayers at different temperatures. This experiment was conceived as part of a joint Diamond-ISIS proposal, which was awarded by Diamond. The Diamond portion of the experiment has been successfully carried out and here we request time to carry out the neutron reflectivity component of the experiment.
DOI: 10.5286/isis.e/isis.e.rb2410609
title: Magnetic excitations in the layered ferromagnet Sr4Ru3O10

description: Sr4Ru3O10 is the triple-layer member of the Ruddlesden-Popper ruthenates series. It exhibits ferromagnetic order below 105 K, and a strong anomalous Hall effect indicates the presence of Weyl points similar to the perovskite SrRuO3. We propose to study the magnetic excitations in Sr4Ru3O10 on Merlin to extend preliminary triple-axis experiments limited to below 12meV. We wish to study the crossover between the low-energy magnons and magnetic excitations more closely determined by the electronic band structure at high energy. Furthermore, we want to search nesting induced scattering reminiscent of the incommensurate fluctuations in Sr2RuO4. Due to the 2D character and due to less severe structural distortions, Sr4Ru3O10 should be even more favourable for these INS studies than the perovskite material.
DOI: 10.5286/isis.e/isis.e.rb2410609-1
title: Magnetic excitations in the layered ferromagnet Sr4Ru3O10

description: Sr4Ru3O10 is the triple-layer member of the Ruddlesden-Popper ruthenates series. It exhibits ferromagnetic order below 105 K, and a strong anomalous Hall effect indicates the presence of Weyl points similar to the perovskite SrRuO3. We propose to study the magnetic excitations in Sr4Ru3O10 on Merlin to extend preliminary triple-axis experiments limited to below 12meV. We wish to study the crossover between the low-energy magnons and magnetic excitations more closely determined by the electronic band structure at high energy. Furthermore, we want to search nesting induced scattering reminiscent of the incommensurate fluctuations in Sr2RuO4. Due to the 2D character and due to less severe structural distortions, Sr4Ru3O10 should be even more favourable for these INS studies than the perovskite material.
DOI: 10.3535/sh0-gs1-8b6
title: Centaurea hyalolepis subsp. negevensis Plitmann

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2300033
title: Effect of deuteration on lipid monolayer phase behaviour as a function of temperature

description: A biological cell membrane is based on a bilayer of lipid molecules, which form a selective barrier in which functional molecules are embedded. The nature of the lipid constituents is important for the action of these molecules and our research aims to link lipid structure with the properties of the monolayers and bilayers they form. Studies of model systems often employ isotopic labelling to separate signals from different constituents in the model. Deuterium labelling is used in spectroscopic and neutron studies on the assumption that the chemical and physical behaviour of the molecules is unchanged. In this study, we propose to determine the conditions in which the assumption is valid and those in which it is not, using x-rays (which are insensitive to isotopic substitution) as the probe to compare structure of deuterated and undeuterated lipid monolayers at different temperatures. This experiment was conceived as part of a joint Diamond-ISIS proposal, which was awarded by Diamond. The Diamond portion of the experiment has been successfully carried out and here we request time to carry out the neutron reflectivity component of the experiment.
DOI: 10.5286/isis.e/isis.e.rb2410035
title: Proton mean kinetic energy in supercooled H_2O+D_2O mixtures

description: The proposing team has achieved important neutron Compton scattering results in the recent past on various samples containing H_2O and D_2O (i.e., fluid water, ice Ih, ice under strong electric fields etc.) measured on VESUVIO, discovering, among other things, the anomalous mean kinetic energy (_{H,D}) increase pertaining to H (or D) in supercooled water. This proposal aims at extending this research to the area of the H_2O+D_2O isotopic mixtures, where the H/D ratio can be used as a sensible handle to vary the system “quanticity”. In particular, we want to verify whether the _H variation with the temperature is simply dictated by the system density change or, conversely, more subtle quantum effects come into play following the H/D ratio of the supercooled mixtures.
DOI: 10.5286/isis.e/isis.e.rb2410035-2
title: Proton mean kinetic energy in supercooled H_2O+D_2O mixtures

description: The proposing team has achieved important neutron Compton scattering results in the recent past on various samples containing H_2O and D_2O (i.e., fluid water, ice Ih, ice under strong electric fields etc.) measured on VESUVIO, discovering, among other things, the anomalous mean kinetic energy (_{H,D}) increase pertaining to H (or D) in supercooled water. This proposal aims at extending this research to the area of the H_2O+D_2O isotopic mixtures, where the H/D ratio can be used as a sensible handle to vary the system “quanticity”. In particular, we want to verify whether the _H variation with the temperature is simply dictated by the system density change or, conversely, more subtle quantum effects come into play following the H/D ratio of the supercooled mixtures.
DOI: 10.3535/9qk-7bq-qa2
title: Lamiaceae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/n1t-4ea-9mv
title: Malvaceae Juss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2420171
title: Enhanced Magnetism in Twisted LSMO Membranes: Moiré Physics or Thickness Effect?

description: We observe enhanced magnetism in twisted (La,Sr)MnO3 membranes transferred to Si/SiO2 substrates. Specifically, samples exhibit a 20 K increase in magnetic transition temperature. Such an enhancement could be a sign of Moiré physics, signifying the stabilization of a flat band through electronic structure interference across the Van der Waals gap. Alternatively, it might be related to strong electron orbital overlap creating a pseudo-"thickness effect". Either case is interesting, but is expected to lead to different magnetization profiles i.e. enhanced specifically near the interface or more uniformly throughout the film. We propose to use PNR to distinguish the two cases.
DOI: 10.5286/isis.e/isis.e.rb2420171-1
title: Enhanced Magnetism in Twisted LSMO Membranes: Moiré Physics or Thickness Effect?

description: We observe enhanced magnetism in twisted (La,Sr)MnO3 membranes transferred to Si/SiO2 substrates. Specifically, samples exhibit a 20 K increase in magnetic transition temperature. Such an enhancement could be a sign of Moiré physics, signifying the stabilization of a flat band through electronic structure interference across the Van der Waals gap. Alternatively, it might be related to strong electron orbital overlap creating a pseudo-"thickness effect". Either case is interesting, but is expected to lead to different magnetization profiles i.e. enhanced specifically near the interface or more uniformly throughout the film. We propose to use PNR to distinguish the two cases.
DOI: 10.5286/isis.e/isis.e.rb2420256-1
title: Exchange-bias in composite CoO/CoFe2O4 nanoparticles
DOI: 10.34816/ifao.archives.232827
title: SAQQARA_nb_1994_03299

description: Référence : nb_1994_03299<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/9ht-62h-aht
title: Hypericum capitatum Choisy

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/c5e-ezr-wfv
title: Caryophyllaceae Juss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2310687-2
title: Can muons measure F− ion diffusion? Exploring two simple test cases
DOI: 10.5286/isis.e/isis.e.rb2420256
title: Exchange-bias in composite CoO/CoFe2O4 nanoparticles
DOI: 10.5286/isis.e/isis.e.rb2490239-1
title: The structure of acetonitrile-D2O clathrates and ices in confinement
DOI: 10.3535/gp8-2b8-ybw
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/qf8-alr-kt7
title: Orchidaceae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2220740-4
title: Testing a new non-destructive protocol to characterize meteorite samples

description: Meteorites can be grouped into three main categories: stony, iron and stony-iron meteorites. Stony meteorites consist of mostly silicate minerals and may contain small spheroidal grains, while iron meteorites consist primarily of an iron-nickel alloy, that was a source of metallic iron in ancient times. These materials play a fundamental role in planetary and cosmological research. To derive the original provenance or dating of a meteorite the main quest is the determination of its composition and traditionally this goal is achieved by means of destructive measurements. Yet, some cross-sections are available, but meteorites are considered rare and further sampling should be avoided. To obtain an in depth information about the bulk meteorite compositions, neutron diffraction, resonant absorption spectroscopy and neutron activation could be a very powerful complementary technique.
DOI: 10.5286/isis.e/isis.e.rb2455026
title: IMAT Imaging Material
DOI: 10.5286/isis.e/isis.e.rb2455026-1
title: IMAT Imaging Material
DOI: 10.34816/ifao.archives.232828
title: SAQQARA_nb_1994_03300

description: Référence : nb_1994_03300<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/avv-j7p-k79
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/xhw-n7y-814
title: Asteraceae Dumort.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2410639
title: Probing the critical floating phase of the S=5/2 Heisenberg antiferromagnetic zigzag spin chain

description: The physics of S = 1/2 one-dimensional spin chain is quite rich, and they offer a viable ground for the experimental realization of correlated quantum states with exotic fractional excitations. On the other hand, the low-dimensional system with large spin (i.e., S =5/2 ) has not been studied extensively as the quantum effects are not supposed to be prominent in these materials. However, a competing interaction such as a second nearest neighbor interaction J2 may introduce frustration and generate new exotic magnetic phases of matter. Surprinsingly, in the rich phase diagram obtained by DMRG of the J1-J2-J3 frustrated spin chain model, a critical “floating” phase was discovered in which the dominant wave-vector q is not “frozen” to any specific value, but “floats” or changes continuously all over the phase. This floating phase appears to be a generic feature of a zigzag chain with half-integer spins S ≥ 3/2, and given its large area in the phase diagram, it is expected to be realized experimentally. Here, we believe we found an excellent realization of such model, with the S = 5/2 quasi-one-dimensional spin system Bi3FeMo2O12.
DOI: 10.5286/isis.e/isis.e.rb2410639-1
title: Probing the critical floating phase of the S=5/2 Heisenberg antiferromagnetic zigzag spin chain

description: The physics of S = 1/2 one-dimensional spin chain is quite rich, and they offer a viable ground for the experimental realization of correlated quantum states with exotic fractional excitations. On the other hand, the low-dimensional system with large spin (i.e., S =5/2 ) has not been studied extensively as the quantum effects are not supposed to be prominent in these materials. However, a competing interaction such as a second nearest neighbor interaction J2 may introduce frustration and generate new exotic magnetic phases of matter. Surprinsingly, in the rich phase diagram obtained by DMRG of the J1-J2-J3 frustrated spin chain model, a critical “floating” phase was discovered in which the dominant wave-vector q is not “frozen” to any specific value, but “floats” or changes continuously all over the phase. This floating phase appears to be a generic feature of a zigzag chain with half-integer spins S ≥ 3/2, and given its large area in the phase diagram, it is expected to be realized experimentally. Here, we believe we found an excellent realization of such model, with the S = 5/2 quasi-one-dimensional spin system Bi3FeMo2O12.
DOI: 10.3535/qsg-wmd-gsl
title: Trifolium Tourn. ex L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/yp9-ffe-xen
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e/isis.e.rb2420178
title: Thermal variation of local structure in LiTa2PO8 solid electrolytes

description: Lithium tantalum phosphate LiTa2PO8 is a new Li+ ion conducting solid electrolyte that shows high room temperature Li+ ion conductivity. Our initial neutron diffraction studies at room temperature have confirmed changes in the lithium ion distribution depending on synthesis conditions. This is further confirmed by high resolution 31P solid state NMR results which suggest a number of local structural motifs are present, despite the crystallography showing only a single phosphorus site. The complex 31P spectrum observed at room temperature collapses into a single broad resonance at around 350 K, suggesting a significant change in the local structure, but this is not accompanied by a significant change in the average crystal structure. A total neutron scattering study of this system is proposed to establish how the Li+ ion distribution and local structure varies with temperature.
DOI: 10.5286/isis.e/isis.e.rb2420178-1
title: Thermal variation of local structure in LiTa2PO8 solid electrolytes

description: Lithium tantalum phosphate LiTa2PO8 is a new Li+ ion conducting solid electrolyte that shows high room temperature Li+ ion conductivity. Our initial neutron diffraction studies at room temperature have confirmed changes in the lithium ion distribution depending on synthesis conditions. This is further confirmed by high resolution 31P solid state NMR results which suggest a number of local structural motifs are present, despite the crystallography showing only a single phosphorus site. The complex 31P spectrum observed at room temperature collapses into a single broad resonance at around 350 K, suggesting a significant change in the local structure, but this is not accompanied by a significant change in the average crystal structure. A total neutron scattering study of this system is proposed to establish how the Li+ ion distribution and local structure varies with temperature.
DOI: 10.5286/isis.e/isis.e.rb2490250-1
title: Low energy spin wave excitations in a 2D magnet NdPt2B