cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2310107
title: Magnetic excitations in a low dimentional quasi-1D spin-one chain: PbCd2Ni6Te3O18

description: Recently one-dimensional (1D) spin-chain systems has attracted considerable attention due to possibility of Haldane formation for an integer spin system. The compounds PbCd2Ni6Te3O18 (M=Cd and Mn) having quasi-1D chains of Ni2+ (S=1) and Mn2+ (S=5/2) in their crystal structure exhibit remarkably interesting magnetic properties. The susceptibility reveals an antiferromagnetic ordering at 25.7 K for M = Cd and 86.0 K for M=Mn. Further, the heat capacity measurements also support the AFM magnetic ground state in both the compounds. Interestingly the susceptibility of M=Cd exhibits a broad maximum above TN indicating the presence of short range magnetic interactions. Our inelastic neutron scattering study on M=Mn on MARI reveals two well defined dispersive magnetic excitations below 20 meV at 5 K. To compare the magnetic exchange strength between Ni-Ni in PbCd2Ni6Te3O18 (M=Cd and Mn) compounds), we proposed to investigate magnetic excitations in M=Cd using the MERLIN spectrometer.
DOI: 10.5286/isis.e.rb2310616-2
title: How it’s made? How are they different? - Examination of medieval and LBA bronze objects by neutron diffraction method.

description: Solt-Tételhegy (Bács-Kiskun County, Hungary) is one of the richest sites of metal archaeological finds in the Carpathian Basin. The finds provide a distinctive variety of artefacts from successive periods, from the Middle Bronze Age (2700 BC) to the beginning of the Ottoman period in the Carpathian basin (1541 AD). More than 2700 metal objects have been recovered. The chemical analysis of the medieval bronze artifacts (with a portable ED-XRF spectrometer) indicated a wide variance in their chemical composition. The finds could be grouped based on the zinc, tin, and iron content of these copper alloys. The classification based on the lead content was uncertain. We propose non-destructive quantitative phase analysis by using neutron diffraction on nine medieval objects (2 measurements/object) to determine the characterization of the material in terms of presence and amount of crystalline phases and microstructure. A multiphase quantitative analysis will provide a clear picture of the composition of the alloys (relative amount of copper, tin, lead) and the microstructural proportions of the crystalline phases, i.e. lead and copper alloy, in the form of substitutional FCC structure.
DOI: 10.3535/62a-zz1-xny
title: Ranunculus illyricus L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220614-1
title: Determination of a local magnetic order of pyrochlore ruthenate Nd2Ru2O7
DOI: 10.5286/isis.e.rb2310616
title: How it’s made? How are they different? - Examination of medieval and LBA bronze objects by neutron diffraction method.

description: Solt-Tételhegy (Bács-Kiskun County, Hungary) is one of the richest sites of metal archaeological finds in the Carpathian Basin. The finds provide a distinctive variety of artefacts from successive periods, from the Middle Bronze Age (2700 BC) to the beginning of the Ottoman period in the Carpathian basin (1541 AD). More than 2700 metal objects have been recovered. The chemical analysis of the medieval bronze artifacts (with a portable ED-XRF spectrometer) indicated a wide variance in their chemical composition. The finds could be grouped based on the zinc, tin, and iron content of these copper alloys. The classification based on the lead content was uncertain. We propose non-destructive quantitative phase analysis by using neutron diffraction on nine medieval objects (2 measurements/object) to determine the characterization of the material in terms of presence and amount of crystalline phases and microstructure. A multiphase quantitative analysis will provide a clear picture of the composition of the alloys (relative amount of copper, tin, lead) and the microstructural proportions of the crystalline phases, i.e. lead and copper alloy, in the form of substitutional FCC structure.
DOI: 10.5286/isis.e.rb2310665-2
title: Investigating the hydrogen bonding network in multiferroic material FeCl5(NH4)2.H2O

description: Multiferroics are an important area of physics and chemistry, where there is a coupling between magnetic moments and electric dipoles. Molecular multiferroics or ones based on metal-organicframeworks are an emerging area of science where molecular systems present some significant advantages over their oxide counterparts asthey are chemically, easier to make and present the opportunity of tuneability. However, there iscurrently a strong drive to fully understand these types of systems. The molecular system FeCl5(NH4)2.H2O, based on the erythrosiderite family of minerals, has attracted some great interest recently. Featuring a ferroelectric/antiferromagnetictransition around 7 K, as well as an order-disorder transition associated with ammonium ion dynamics at ~80 K, the behaviour of thisinteresting material warrantsfurther study. Our previousinvestigations have focused on the magnetic properties, including the persistence of magneticshort-range order between 7-20 K. We now seek to investigate how these two transitions affect the hydrogenbond network within the material in order to shed light on the bulk material properties.
DOI: 10.5286/isis.e.rb2390154-1
title: Single crystal diffraction study of the triangular lattice Kondo antiferromagnet Ce2PdSi3
DOI: 10.3535/6ed-e3h-z0k
title: Orchis sambucina L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/l3p-46t-pp9
title: Orchis purpurea subsp. purpurea

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220470-1
title: Characterization of RS relaxation and precipitation behaviours as a function of energy input in a L-PBF IN718 material
DOI: 10.5286/isis.e.rb2220614
title: Determination of a local magnetic order of pyrochlore ruthenate Nd2Ru2O7
DOI: 10.3535/p7z-454-ez8
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/txx-t03-5bz
title: Pittosporum undulatum Vent.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220470
title: Characterization of RS relaxation and precipitation behaviours as a function of energy input in a L-PBF IN718 material
DOI: 10.5286/isis.e.rb2310046
title: Cu3LiRu2O6: a 4d4 (Jeff = 1) based possible Quantum Spin Liquid

description: Honeycomb lattices are a fertile playground for exploring Kitaev physics. The interplane spacing can be tuned by changing the spacer atom (H, Ag, or Cu in our case). This impacts the magnetic in-plane interactions. Also, the magnetic atoms in the honeycomb plane can be changed (Ir, Ru or a mixture of the two) to tailor the magnetism of the system. The phase diagram is rich: ranging from the usual ordered state to the Kitaev Spin Liquid state with dynamic moments. In the given proposal, muSR will be carried out to probe the nature of the ground state in Cu3LiRu2O6 which shows no sign of long-range order down to 400 mK whereas a non-zero spin susceptibility is inferred from the 7Li NMR shift data. It appears that the Ru4+ is stabilised in a magnetic state rather than the expected J = 0 state. The formation of the novel excitonic spin liquid might be suggested in this case. Muon depolarisation rate and its temperature dependence, effect of longitudinal field on the decoupling will be examined.
DOI: 10.5286/isis.e.rb2310046-1
title: Cu3LiRu2O6: a 4d4 (Jeff = 1) based possible Quantum Spin Liquid

description: Honeycomb lattices are a fertile playground for exploring Kitaev physics. The interplane spacing can be tuned by changing the spacer atom (H, Ag, or Cu in our case). This impacts the magnetic in-plane interactions. Also, the magnetic atoms in the honeycomb plane can be changed (Ir, Ru or a mixture of the two) to tailor the magnetism of the system. The phase diagram is rich: ranging from the usual ordered state to the Kitaev Spin Liquid state with dynamic moments. In the given proposal, muSR will be carried out to probe the nature of the ground state in Cu3LiRu2O6 which shows no sign of long-range order down to 400 mK whereas a non-zero spin susceptibility is inferred from the 7Li NMR shift data. It appears that the Ru4+ is stabilised in a magnetic state rather than the expected J = 0 state. The formation of the novel excitonic spin liquid might be suggested in this case. Muon depolarisation rate and its temperature dependence, effect of longitudinal field on the decoupling will be examined.
DOI: 10.3535/npg-0kr-rzq
title: Ranunculus ophioglossifolius Vill.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/zfn-614-fpt
title: Neotinea ustulata (L.) R.M.Bateman, Pridgeon & M.W.Chase

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220386
title: Solving the structure-property relationship in Ba4Ir3O10
DOI: 10.5286/isis.e.rb2220386-1
title: Solving the structure-property relationship in Ba4Ir3O10
DOI: 10.5286/isis.e.rb2300079-1
title: High-energy spin dynamics of the high-Tc nickelate superconductor La3Ni2O7

description: The mechanism of high-Tc superconductivity has been a long-standing question for several decades. In cuprate and iron-based superconductors, spin fluctuations have been widely believed to be important for the superconductivity. Recently, our group reported the superconductivity in the bilayer nickelate La3Ni2O7 with a maximum Tc of 80 K under pressure. So far, key spectroscopic results about the spin dynamics are absent to clarify if spin fluctuations are also important for the high-Tc superconductivity in La3Ni2O7. In last cycle, we have successfully performed an INS experiment on a powder sample of La3Ni2O7 at MERLIN to get INS results below 160 meV. However, no observable spin-excitation signal can be seen. A possible reason for the absence of spin fluctuation in La3Ni2O7 could be the formation of dimer singlet due to the bilayer structure. Based on the theoretical predictions, the intradimer interaction Jc can be as high as 180 meV, which means that there could be spin excitations from dimers in higher-energy region (beyond the coverage of the Ei = 160 meV at MERLIN). To clarify if there are dimer-induced spin excitations above 160 meV, we propose to perform high-energy INS measurements with higher Ei = 400 meV at MAPS on the same La3Ni2O7 sample. The coming results and our previous results from MERLIN experiment will provide a clear and complete picture on the spin dynamics of La3Ni2O7, which is crucial to understand its high-Tc superconductivity.
DOI: 10.3535/5dx-f1c-c38
title: Ranunculus parviflorus Loefl.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/kwe-e17-3cm
title: Astelia papuana Skottsb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2300079
title: High-energy spin dynamics of the high-Tc nickelate superconductor La3Ni2O7

description: The mechanism of high-Tc superconductivity has been a long-standing question for several decades. In cuprate and iron-based superconductors, spin fluctuations have been widely believed to be important for the superconductivity. Recently, our group reported the superconductivity in the bilayer nickelate La3Ni2O7 with a maximum Tc of 80 K under pressure. So far, key spectroscopic results about the spin dynamics are absent to clarify if spin fluctuations are also important for the high-Tc superconductivity in La3Ni2O7. In last cycle, we have successfully performed an INS experiment on a powder sample of La3Ni2O7 at MERLIN to get INS results below 160 meV. However, no observable spin-excitation signal can be seen. A possible reason for the absence of spin fluctuation in La3Ni2O7 could be the formation of dimer singlet due to the bilayer structure. Based on the theoretical predictions, the intradimer interaction Jc can be as high as 180 meV, which means that there could be spin excitations from dimers in higher-energy region (beyond the coverage of the Ei = 160 meV at MERLIN). To clarify if there are dimer-induced spin excitations above 160 meV, we propose to perform high-energy INS measurements with higher Ei = 400 meV at MAPS on the same La3Ni2O7 sample. The coming results and our previous results from MERLIN experiment will provide a clear and complete picture on the spin dynamics of La3Ni2O7, which is crucial to understand its high-Tc superconductivity.
DOI: 10.5286/isis.e.rb2320068
title: de Gennes’s mesh size in cartilage-inspired self-repairing alginate LipoGels

description: Inspired by the exceptional lubricity in living systems (e.g. knee joints and eye blinking), a physically cross-linked hydrogel film has been prepared from sodium alginate, an abundant green biopolymer derived from brown algae. Alginate hydrogels were cross-linked by divalent cations, Ca2+, and liposomes (or lipid vesicles) were embedded into the gel, aiming to generate a lubricious and self-repairing material, also with the potential for therapeutic encapsulation. The lubrication performance of the alginate hydrogels was evaluated with a tribometer (UMT Tribolab), and the results showed that the 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) embedded alginate hydrogel exhibited excellent lubrication with a coefficient of friction (CoF) of 0.058 under water. However, to our best knowledge, no structural characterisation has been reported on such novel lubricious liposome-embedded hydrogels. Here, we propose a small angle neutron scattering (SANS) study of the hydrogel nanostructure, varying the alginate concentration, cross-linking conditions, type of lipids, and temperature. The unprecedented results offer structural insights into alginate hydrogels, enabling a correlation with the mechanical characterisation of the gel using nanoindenter and rheometer. Ultimately, this will underpin the rational design of robust hydrogels with tailored nanostructures for biomimetic lubrication.
DOI: 10.5286/isis.e.rb2320068-1
title: de Gennes’s mesh size in cartilage-inspired self-repairing alginate LipoGels

description: Inspired by the exceptional lubricity in living systems (e.g. knee joints and eye blinking), a physically cross-linked hydrogel film has been prepared from sodium alginate, an abundant green biopolymer derived from brown algae. Alginate hydrogels were cross-linked by divalent cations, Ca2+, and liposomes (or lipid vesicles) were embedded into the gel, aiming to generate a lubricious and self-repairing material, also with the potential for therapeutic encapsulation. The lubrication performance of the alginate hydrogels was evaluated with a tribometer (UMT Tribolab), and the results showed that the 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) embedded alginate hydrogel exhibited excellent lubrication with a coefficient of friction (CoF) of 0.058 under water. However, to our best knowledge, no structural characterisation has been reported on such novel lubricious liposome-embedded hydrogels. Here, we propose a small angle neutron scattering (SANS) study of the hydrogel nanostructure, varying the alginate concentration, cross-linking conditions, type of lipids, and temperature. The unprecedented results offer structural insights into alginate hydrogels, enabling a correlation with the mechanical characterisation of the gel using nanoindenter and rheometer. Ultimately, this will underpin the rational design of robust hydrogels with tailored nanostructures for biomimetic lubrication.
DOI: 10.3535/clq-xbn-ygd
title: Astelia papuana Skottsb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2320147-1
title: Neutron diffraction study of Ga and Al-doped MnNiGe alloys under external magnetic field

description: Magnetic equiatomic alloys (MEAs) of the general formula MM′X (M, M′ = transition metals, X = Si, Ge, Sn) undergo magnetostructural transition of martensitic type on cooling from high temperature. In this proposal, our aim is to focus on the effect of external magnetic field on the magnetic structure of two Ge-site doped MnNiGe alloys of nominal compositions MnNiGe0.9Al0.1 and MnNiGe0.928Ga0.072 where magnetic structure plays a crucial role behind their magneto-functionality. We have already performed ambient pressure neutron diffraction measurement in zero field previously and published our results in Physical Review B.
DOI: 10.5286/isis.e.rb2320266
title: Magnetic excitations in uniaxial-strained α-RuCl3

description: The concept of the quantum spin liquid (QSL) was originally proposed by Anderson in 1973, describing a correlated system that does not order even at zero temperature. Among various proposals for QSL, α-RuCl3 has attracted particular attention. It is worth noting that the spin waves exhibiting six-fold symmetry and the spin-excitation continuum showing isotropic feature were actually measured on twinned crystals. Previously, structure and magnetic twinning domains were found in most α-RuCl3 crystals at low temperatures. At Ts≈80-160K, α-RuCl3 undergoes a first-order structural transition and enters a C2/m structure. The structural transition with a significant change in lattice parameter provides a possibility of detwinning the sample using uniaxial strain. At TN=6-14K, α-RuCl3 enters a zigzag order state. There are three possible configurations of zigzag orders, corresponding to the C2 symmetric magnetic Brillouin zones and antiferromagnetic wave vectors. The coexistence of the three magnetic twinning domains results in the C6 symmetric spin waves and the isotropic excitation continuum. To better understand the magnetic ground state and the magnetic interactions, measuring the spin excitations in detwinned samples is necessary. Thus, we propose to study the spin excitations of uniaxial-strained α-RuCl3 with uniaxial strain upto 0.6% using a low-background uniaxial strain device.
DOI: 10.5286/isis.e.rb2320266-1
title: Magnetic excitations in uniaxial-strained α-RuCl3

description: The concept of the quantum spin liquid (QSL) was originally proposed by Anderson in 1973, describing a correlated system that does not order even at zero temperature. Among various proposals for QSL, α-RuCl3 has attracted particular attention. It is worth noting that the spin waves exhibiting six-fold symmetry and the spin-excitation continuum showing isotropic feature were actually measured on twinned crystals. Previously, structure and magnetic twinning domains were found in most α-RuCl3 crystals at low temperatures. At Ts≈80-160K, α-RuCl3 undergoes a first-order structural transition and enters a C2/m structure. The structural transition with a significant change in lattice parameter provides a possibility of detwinning the sample using uniaxial strain. At TN=6-14K, α-RuCl3 enters a zigzag order state. There are three possible configurations of zigzag orders, corresponding to the C2 symmetric magnetic Brillouin zones and antiferromagnetic wave vectors. The coexistence of the three magnetic twinning domains results in the C6 symmetric spin waves and the isotropic excitation continuum. To better understand the magnetic ground state and the magnetic interactions, measuring the spin excitations in detwinned samples is necessary. Thus, we propose to study the spin excitations of uniaxial-strained α-RuCl3 with uniaxial strain upto 0.6% using a low-background uniaxial strain device.
DOI: 10.3535/06p-r6h-y4j
title: Ranunculus nodiflorus L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/tvy-fl9-3ka
title: Astelia papuana Skottsb.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220309
title: Explore Spin phonon coupling in the multiferroic orthoferrites HoFeO3
DOI: 10.5286/isis.e.rb2220309-1
title: Explore Spin phonon coupling in the multiferroic orthoferrites HoFeO3
DOI: 10.5286/isis.e.rb2320147
title: Neutron diffraction study of Ga and Al-doped MnNiGe alloys under external magnetic field

description: Magnetic equiatomic alloys (MEAs) of the general formula MM′X (M, M′ = transition metals, X = Si, Ge, Sn) undergo magnetostructural transition of martensitic type on cooling from high temperature. In this proposal, our aim is to focus on the effect of external magnetic field on the magnetic structure of two Ge-site doped MnNiGe alloys of nominal compositions MnNiGe0.9Al0.1 and MnNiGe0.928Ga0.072 where magnetic structure plays a crucial role behind their magneto-functionality. We have already performed ambient pressure neutron diffraction measurement in zero field previously and published our results in Physical Review B.
DOI: 10.3535/kr1-4ts-6xq
title: Neotinea ustulata (L.) R.M.Bateman, Pridgeon & M.W.Chase

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/t8l-43x-sf2
title: Ranunculus nodiflorus L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310600
title: Understanding the giant barocaloric effects and thermal hysteresis in Mn3(A,B)N using inelastic neutron scattering

description: Materials with large caloric effects have the potential to play a major role in decarbonising our heating and cooling, which makes up over 20% of the UK’s CO2 emissions. Barocaloric materials have recently shown great promise in usurping conventional hydrocarbon refrigerants. Giant barocaloric effects (BCE) have recently been observed in the geometrically frustrated antiperovskite Mn3GaN at the 1st-order antiferromagnetic transition (TN), enhanced by suppressed spin fluctuations in the ordered phase. Our recent results on the closely related Mn3NiN have revealed yet larger entropy changes, which we interpret as due to differences in the nature of the electronic hybridisation with Mn between the Ni and Ga compounds. In order to understand the underlying mechanisms of the BCE, we have recently performed inelastic neutron scattering and pair distribution function (PDF) experiments on various Mn3AN, the first such experiments on Mn-based antiperovskites. We have found anomalous and A-site dependent phonon temperature dependencies close to TN, which is consistent with our prediction of the different mechanisms that drive this 1st-order transition. To complete our study, we propose to measure these features in Mn3(A,B)N, where not only are BCE large but thermal hysteresis of the transition (highly detrimental to cyclic BCE performance) is an order of magnitude smaller than Mn3AN.