cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2420393-1
title: Temperature-dependent Behaviour of Jahn−Teller Distortions in Defect-free LiNiO2

description: This work aims to investigate the nature of Jahn−Teller (JT) distortions in candidate lithium-ion cathode material lithium nickel oxide, LiNiO2 (LNO). LNO typically crystallises in the rhombohedral space group R-3m, where the threefold symmetry precludes a macroscopic JT distortion despite the low-spin d7 electronic configuration of the Ni3+. Previous neutron PDF measurements confirm local JT distortions in this material at low temperatures but their exact nature—whether they are dynamic or static, and in turn their spatial distribution—remains an open question. Our previous AIMD calculations indicate the important role that point defects play in the behaviour and spatial coherence of the JT distortions, pinning the undistorted domains. We have an ion-exchanged LNO sample, synthesised from the sodium analogue NaNiO2 (NNO), which retains the defect-free property of the NNO. A deeper understanding of the JT distortions and their temperature sensitivity in a sample with no defects will improve our understanding of the interplay between orbital, magnetic and elastic degrees of freedom in LNO, and act as a starting point for understanding the wider influence of point-defects in LNO as well as the structure of the material at different stages of lithiation.
DOI: 10.5286/isis.e.rb2490277-1
title: Recovered High Pressure Perovskites
DOI: 10.34816/ifao.archives.232880
title: SAQQARA_nb_1994_03359

description: Référence : nb_1994_03359<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/a7h-e9z-mgn
title: Scandix pecten-veneris L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/y95-q9q-p54
title: Chardinia orientalis (L.) Kuntze

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2420157-1
title: Complex magnetic structure of a new pressure-induced Kondo lattice superconductor

description: In unconventional superconductors such as heavy fermion and high-Tc superconductors, superconductivity is believed to be mediated by spin fluctuations, rather than the electron-phonon pairing mechanism of BCS theory. However, the microscopic mechanisms of spin-fluctuation mediated superconductivity are not yet determined, and it is important to understand the nature of the magnetism that occurs in close proximity to unconventional superconductivity. We propose to use single-crystal neutron diffraction to determine the magnetic structure of CeSb2 at ambient pressure. CeSb2 orders antiferromagnetically at ambient pressure, and was recently found to exhibit superconductivity under pressure upon the suppression of antiferromagnetism, with highly unusual behaviour of the upper critical field. Previous neutron scattering measurements show complex magnetic ordering in CeSb2 with three magnetic transitions, where there are multiple magnetic propagation vectors but the magnetic structures are not determined. We will perform detailed neutron diffraction measurements in three magnetic phases using the SXD instrument, so as to collect the intensity of the magnetic Bragg reflections, and determine the magnetic structures. These results will provide important information for understanding the magnetic exchange interactions, which give rise to both the ordered magnetic state at ambient pressure, and the unconventional, possibly spin-triplet, heavy fermion superconductivity under pressure.
DOI: 10.5286/isis.e.rb2420263
title: How does Cr doping Mn(3-x)CrxSn influence the magnetic interactions?

description: Mn3Sn and Mn$_3$Ge display a large Anomalous Hall Effect (AHE) at room temperature, which can easily be controlled with a weak external magnetic field. It is therefore an excellent candidate material for spintronic applications 
The large AHE is closely linked to the magnetic structure, where the Mn spins in the triangular ab plane form a 120 degree structure which breaks inversion symmetry. However, Mn3Sn enters a helical phase upon cooling below 290 K, and the AHE vanishes.
We are investigating how to tune the AHE using chemical substitution. Very recent results indicate that the helical phase can be suppressed by small amounts of Cr. We further find that the low energy excitations show signatures of proximity to the helical phase. The helical phase in the parent compound is stabilized by the interplay of up to 8th nearest exchange interactions, as well as anisotropy. We here want to complete our inelastic study of Mn(3-x)CrxSn. We will do this by measuring the spin waves in Mn(3-x)CrxSn, to determine how these parameters change to suppress the helical phase and preserve the AHE.
DOI: 10.5286/isis.e.rb2420263-1
title: How does Cr doping Mn(3-x)CrxSn influence the magnetic interactions?

description: Mn3Sn and Mn$_3$Ge display a large Anomalous Hall Effect (AHE) at room temperature, which can easily be controlled with a weak external magnetic field. It is therefore an excellent candidate material for spintronic applications 
The large AHE is closely linked to the magnetic structure, where the Mn spins in the triangular ab plane form a 120 degree structure which breaks inversion symmetry. However, Mn3Sn enters a helical phase upon cooling below 290 K, and the AHE vanishes.
We are investigating how to tune the AHE using chemical substitution. Very recent results indicate that the helical phase can be suppressed by small amounts of Cr. We further find that the low energy excitations show signatures of proximity to the helical phase. The helical phase in the parent compound is stabilized by the interplay of up to 8th nearest exchange interactions, as well as anisotropy. We here want to complete our inelastic study of Mn(3-x)CrxSn. We will do this by measuring the spin waves in Mn(3-x)CrxSn, to determine how these parameters change to suppress the helical phase and preserve the AHE.
DOI: 10.3535/av8-wcf-fxx
title: Crataegus × sinaica Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/vw1-fdv-pvg
title: Crataegus × sinaica Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410267-2
title: Subtle Structural changes in the new layered oxide chalcogenide Sr3Fe4S2O6

description: This proposal is to explore the subtle structural changes with temperature of a new mixed-valent iron oxide chalcogenide compound and relate the changes to the evolution of the magnetic ordering and electronic properties. In particular we will use high-resolution powder diffraction between 5 K and 950 K to probe the monoclinic distortion and the nature of the structural transitions in Sr3Fe4S2O6 as a function of temperature and how they are related to the evolution of the magnetic ordering.
DOI: 10.5286/isis.e.rb2420157
title: Complex magnetic structure of a new pressure-induced Kondo lattice superconductor

description: In unconventional superconductors such as heavy fermion and high-Tc superconductors, superconductivity is believed to be mediated by spin fluctuations, rather than the electron-phonon pairing mechanism of BCS theory. However, the microscopic mechanisms of spin-fluctuation mediated superconductivity are not yet determined, and it is important to understand the nature of the magnetism that occurs in close proximity to unconventional superconductivity. We propose to use single-crystal neutron diffraction to determine the magnetic structure of CeSb2 at ambient pressure. CeSb2 orders antiferromagnetically at ambient pressure, and was recently found to exhibit superconductivity under pressure upon the suppression of antiferromagnetism, with highly unusual behaviour of the upper critical field. Previous neutron scattering measurements show complex magnetic ordering in CeSb2 with three magnetic transitions, where there are multiple magnetic propagation vectors but the magnetic structures are not determined. We will perform detailed neutron diffraction measurements in three magnetic phases using the SXD instrument, so as to collect the intensity of the magnetic Bragg reflections, and determine the magnetic structures. These results will provide important information for understanding the magnetic exchange interactions, which give rise to both the ordered magnetic state at ambient pressure, and the unconventional, possibly spin-triplet, heavy fermion superconductivity under pressure.
DOI: 10.5286/isis.e.rb2420362-1
title: Influence of ferrimagnetic shell thickness on the pinning processes

description: Core/shell magnetic nanoparticle systems (NPs) exhibiting different sizes of antiferromagnetic cores and ferrimagnetic shells will be studied by employing half-polarized small-angle neutron scattering (SANSPOL). The main objective is to unravel the nature of the core/shell interface changes with oxidation time and pinning processes between core/shell with decreasing antiferromagnetic core size after magnetic reversal. The results of our approach will ultimately uncover the entanglement between the macroscopic response (exchange bias) and the core/shell structure. Revealing the correlation of the magnetic order and structure with the strength of exchange-bias coupling is highly important for explaining relaxation effects, which are technologically relevant for magnetic hyperthermia and the magnetic microstructure.
DOI: 10.34816/ifao.archives.232881
title: SAQQARA_nb_1994_03360

description: Référence : nb_1994_03360<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/64v-rsz-wr2
title: Crataegus × sinaica Boiss.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/cwx-dng-j9v
title: Mitraria coccinea Cav.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310112
title: Nanostructure of Co-Assembled Viscoelastic Protein Nanosheets for Bioemulsion Design

description: Our recent data is demonstrating that co-assembly of proteins allows tuning the viscoelastic properties of liquid-liquid interfaces and the formation of an elastic network. We propose that this is due to changes in protein conformation taking place upon co-assembly and the maximisation of packing at corresponding liquid-liquid interfaces. The aim of this proposal is to use combinations of bovine serum albumins (BSA, including supercharged), casein, and reactive co-surfactants to correlate changes in associated nanostructures with their interfacial viscoelastic properties.
DOI: 10.5286/isis.e.rb2310112-1
title: Nanostructure of Co-Assembled Viscoelastic Protein Nanosheets for Bioemulsion Design

description: Our recent data is demonstrating that co-assembly of proteins allows tuning the viscoelastic properties of liquid-liquid interfaces and the formation of an elastic network. We propose that this is due to changes in protein conformation taking place upon co-assembly and the maximisation of packing at corresponding liquid-liquid interfaces. The aim of this proposal is to use combinations of bovine serum albumins (BSA, including supercharged), casein, and reactive co-surfactants to correlate changes in associated nanostructures with their interfacial viscoelastic properties.
DOI: 10.5286/isis.e.rb2420362
title: Influence of ferrimagnetic shell thickness on the pinning processes

description: Core/shell magnetic nanoparticle systems (NPs) exhibiting different sizes of antiferromagnetic cores and ferrimagnetic shells will be studied by employing half-polarized small-angle neutron scattering (SANSPOL). The main objective is to unravel the nature of the core/shell interface changes with oxidation time and pinning processes between core/shell with decreasing antiferromagnetic core size after magnetic reversal. The results of our approach will ultimately uncover the entanglement between the macroscopic response (exchange bias) and the core/shell structure. Revealing the correlation of the magnetic order and structure with the strength of exchange-bias coupling is highly important for explaining relaxation effects, which are technologically relevant for magnetic hyperthermia and the magnetic microstructure.
DOI: 10.3535/013-ac3-y8p
title: Asteranthera ovata (Cav.) Hanst.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/q2w-1wb-3ea
title: Hypericum sphaerocarpum Michx.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2410421
title: Determination of the local structural effects in the High Entropy Alloy system AlVCrMnFe

description: Since their inception, High entropy alloys have become one of the most studied and rapidly expanding fields in metallurgy, opening a new compositional space for alloy design. Many of their beneficial properties are thought to be linked to the founding principles of the field. These principles are fundamentally based on local structural effects, making an understanding of the local-structure property links essential if such materials are to be successful industrially employed, or tailored and tuned for purpose. Owing to their potentially promising radiation damage tolerance properties, the atomic energy sector is keen to explore this compositional space further. The system AlVCrMnFe has been proposed as a potential candidate, owing to the short active life of the constituent elements.

In this experiment, we will use total scattering to understand the local structure in AlVCrMnFe and compositional related simpler materials. Our previous work has demonstrated a method for determining local static distortions experimentally using total scattering in HEAs, and has been key in challenging one of the core principles, that these materials are necessarily highly strained. By conducting variable temperature experiments, the relative magnitude of static and dynamic displacements in this system may be separated. This will provide an understanding of the level of distortion within the structure, and identify any short-range order occurring within these industrially important materials.
DOI: 10.5286/isis.e.rb2410421-1
title: Determination of the local structural effects in the High Entropy Alloy system AlVCrMnFe

description: Since their inception, High entropy alloys have become one of the most studied and rapidly expanding fields in metallurgy, opening a new compositional space for alloy design. Many of their beneficial properties are thought to be linked to the founding principles of the field. These principles are fundamentally based on local structural effects, making an understanding of the local-structure property links essential if such materials are to be successful industrially employed, or tailored and tuned for purpose. Owing to their potentially promising radiation damage tolerance properties, the atomic energy sector is keen to explore this compositional space further. The system AlVCrMnFe has been proposed as a potential candidate, owing to the short active life of the constituent elements.

In this experiment, we will use total scattering to understand the local structure in AlVCrMnFe and compositional related simpler materials. Our previous work has demonstrated a method for determining local static distortions experimentally using total scattering in HEAs, and has been key in challenging one of the core principles, that these materials are necessarily highly strained. By conducting variable temperature experiments, the relative magnitude of static and dynamic displacements in this system may be separated. This will provide an understanding of the level of distortion within the structure, and identify any short-range order occurring within these industrially important materials.
DOI: 10.5286/isis.e.rb2420464-1
title: Mechanistic Understanding of Creep-Fatigue led Degradation of Electron Bean Welded ODS Steels in Tension and Compression Hold

description: Welding of thick steel plates are essential requirement of future nuclear power plant components. The welding processes generate residual stresses, which can have negative effects on the service life of welded components or structures. When present in addition to external loadings, residual stresses can contribute to premature component failure and can affect crack initiation and growth. Due to extremely high temperature in future nuclear power plants, instability of the residual stress in complex creep-fatigue loading environment is of significant concern for the structural integrity of welded components. In this experiment, we will use Electron Beam Welded (EBM) and Gas Tungsten Arc Welded (GTAW) Ferritic- Martensitic Steel and AISI 316(L) 30mm thick welds of recently funded pilot project SiMeW (Simulation and Measurement of Welds) of The Joint Programme on Nuclear Materials of the European Energy Research Alliance (EERA-JPNM). The experiment will lead to development of an empirical model of residual stress stability in tension and compression creep holds at extremely high temperature 700℃ which will be used in Gen-IV nuclear reactors.
DOI: 10.34816/ifao.archives.232882
title: SAQQARA_nb_1994_03361

description: Référence : nb_1994_03361<br />Site : Saqqara<br />Secteur : Mastaba de Ti<br />Type : photographie<br />
DOI: 10.3535/dlm-gzb-5b5
title: Nothofagus pumilio (Poepp. & Endl.) Krasser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310655-3
title: Real Time in-situ Mineral Carbonation for CO2 Utilisation and Permanent Sequestering - QENS tracking

description: We propose real-time in situ tracking of CO2-mineralisation reactions for long-term sequestering of CO2(gas) in carbonates. Both Na and Mg-carbonates are currently under investigation a the atomistic/nanoscopic, trhough meso- and micro-scopic to bulk scales. The output carbonates stabilise CO2 as solid-minerals [i.e. Na/Mg-CO3]; added-value products in the infrastructure, fertiliser, pulp&paper and other industries. Our work at the bulk scale involves the production of multi-kg scales of carbonates under industrial conditions and relevant raw-material (im)purities, with subsequent use as fillers/additives to concretes of standard sizes and subsequent compliance testing (ISO1920-4, size:15x15x15cm, compressive-strength). We seek to further resolve the fundamental phenomena and processes underlying the reaction kinetics and responsible for product identities and purities. In this case QENS measurements on OSIRIS/IRIS will provide valuable information on the manifold rotational (and other!) dynamics of these systems and processes.
DOI: 10.5286/isis.e.rb2420406-1
title: Magnetic structure in the S = 1/2 frustrated pyrochlore slab antiferromagnet Averievite Cu5(VO4)2O2CsCl

description: The search for quantum spin liquids (QSLs) remains a cornerstone of condensed matter physics. The S = 1/2 kagome Heisenberg magnet (KHM) is considered the most promising model system for the realisation of 2D QSLs. We have synthesised high quality powders of a new S=1/2 KHM averievite and its Zn-doped variants ZnxCu5–x(VO4)2O2CsCl, where x = 0, 1 and 2. We have performed extensive magnetometry, neutron diffraction (exp no. RB1920248) and inelastic neutron scattering (exp no. 4-05-746) measurements on our range of Zn-averievite samples between 0 &lt; x &lt; 2. Our results demonstrate the evolution of magnetic order to disorder with increased Zn doping, towards a potential QSL state in the ideal kagome geometry of x = 2. However, there are three major limitations with the data we have thus far collected due to the fact that the samples are powders: (i) the magnetic structure of x=0 cannot be uniquely refined; (ii) the spin waves of x=0 cannot be modelled using linear spin wave theory to extract exchange parameters; (iii) the powder-averaged Q-dependence of the diffuse excitations for x=2 do not allow confirmation of a QSL state. We will use this experiment to uniquely resolve the magnetic structure for x=0 using single crystal diffraction on WISH. The results will in turn aid the modelling of the spin waves in future inelastic scattering experiments and, ultimately, deepen our understanding of the potential QSL state when x=2.
DOI: 10.5286/isis.e.rb2420464
title: Mechanistic Understanding of Creep-Fatigue led Degradation of Electron Bean Welded ODS Steels in Tension and Compression Hold

description: Welding of thick steel plates are essential requirement of future nuclear power plant components. The welding processes generate residual stresses, which can have negative effects on the service life of welded components or structures. When present in addition to external loadings, residual stresses can contribute to premature component failure and can affect crack initiation and growth. Due to extremely high temperature in future nuclear power plants, instability of the residual stress in complex creep-fatigue loading environment is of significant concern for the structural integrity of welded components. In this experiment, we will use Electron Beam Welded (EBM) and Gas Tungsten Arc Welded (GTAW) Ferritic- Martensitic Steel and AISI 316(L) 30mm thick welds of recently funded pilot project SiMeW (Simulation and Measurement of Welds) of The Joint Programme on Nuclear Materials of the European Energy Research Alliance (EERA-JPNM). The experiment will lead to development of an empirical model of residual stress stability in tension and compression creep holds at extremely high temperature 700℃ which will be used in Gen-IV nuclear reactors.
DOI: 10.21233/n3kr4d
title: Sand pollen surface sample dataset

description: Raw data for the Sand pollen surface sample dataset submitted to the Neotoma Paleoecology Database. Data is available through the landing page in JSON format. The landing page referenced by the DOI also contains links to publications and a map-based viewer for the dataset. The Neotoma Paleoecology Database maintains a homepage at https://www.neotomadb.org.
DOI: 10.3535/mfh-2sq-pyw
title: Lysimachia lanceola (Baudo) Hassemer, Funez & R. Trevis.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/v8k-g32-97s
title: Viola L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2070013
title: Spin Dynamics Study in a Distorted Triangular Lattice System lambda-(STF)2GaCl4

description: Research on quantum spin liquid (QSL) state in frustrated magnetism is a critical issue in the field of condensed matter physics and some candidates for QSL have been found in organic conductors. It is still open question what plays essential for the QSL and nearby superconducting state, the frustration or disorder. To settle this discussion, we focused on the new candidate of QSL, λ-(STF)2GaCl4, whose lattice geometry is deviated from the regular triangular lattice. In the previous beamtime, we used Heliox and observed the homogeneous staggered moment growth at low temperature, however, we cannot observe its temperature dependence towards absolute zero. By clarifying the spin dynamics of this material through this proposed experiments using the dilution refrigerator, it will lead to an understanding of QSL and the elucidation of the origin of nearby superconducting phases.