cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2310311-1
title: Investigation of local magnetic moment fluctuations and their correlation with topological insulating behaviour of transition metal doped Sb2Te3

description: While a magnetic topological Insulator (MTI) has enormous application potential, the retention of magnetism in a topological insulator (TI) is challenging. Transition metal (TM) dopants can be used to modify the defect concentration and induce disorder in the TI, Sb2Te3. Our measurements reveal that the hole (major carrier) contribution is supressed by TM (=Fe, Co, Ni) doping in pristine Sb2Te3. The higher resistivity of all TM doped samples, viz, Sb1.97TM0.03Te3 also demonstrates that magnetic doping increases the bulk insulating behaviour of Sb2Te3. A low carrier concentration and high resistivity have been identified as two significant features for retaining TI behaviour. Here, we will exploit Muon spectroscopy to investigate changes in local magnetism and its correlation with TI properties in TM-doped Sb2Te3. Characterizing the both the static and dynamic fluctuations of the magnetic moments will provide new insights into the impact of the TM dopant on the local magnetic structure of a TI material.
DOI: 10.5286/isis.e.rb2320086
title: Low energy magnetic excitations in triangular-lattice compound PrMgAl11O19

description: Searching for new compounds free from impurity and/or structure disorder is essential for realizing the quantum spin liquid (QSL) state. We have identified a new rare-earth-based triangular-lattice compound PrZnAl11O19 as a good QSL candidate with a perfect triangular structure and no magnetic ordering down to 0.05 K based on powder measurements. Having centimeter-sized single crystals now using the optical floating zone technique, we propose to study the detailed low-energy magnetic excitations in its analog PrMgAl11O19. Whether or not the appearance of the excitation continuum due to the spinon will be essential to answer if the compound is in the QSL state. For this purpose, we ask for 3 days beamtime on the LET spectrometer equipped with a heliox that could cool down to 300 mK.
DOI: 10.5286/isis.e.rb2320086-1
title: Low energy magnetic excitations in triangular-lattice compound PrMgAl11O19

description: Searching for new compounds free from impurity and/or structure disorder is essential for realizing the quantum spin liquid (QSL) state. We have identified a new rare-earth-based triangular-lattice compound PrZnAl11O19 as a good QSL candidate with a perfect triangular structure and no magnetic ordering down to 0.05 K based on powder measurements. Having centimeter-sized single crystals now using the optical floating zone technique, we propose to study the detailed low-energy magnetic excitations in its analog PrMgAl11O19. Whether or not the appearance of the excitation continuum due to the spinon will be essential to answer if the compound is in the QSL state. For this purpose, we ask for 3 days beamtime on the LET spectrometer equipped with a heliox that could cool down to 300 mK.
DOI: 10.3535/dre-n00-ewq
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/j0c-jnk-lfc
title: Plantae

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220449
title: An exploration of the vibrational properties of amorphous energetic materials using Inelastic Neutron Scattering

description: This proposal seeks to measure Inelastic Neutron Scattering spectra for a series of amorphous energetic materials. The results of these experiments will provide crucial insight into the properties of amorphous energetic materials and in particular their sensitivity to initiation by mechanical impact. The experimental validation of theoretical models will offer invaluable contributions to the development of novel theoretical approaches. The development and validation of such models would be of immense value to industrial and academic efforts to produce safer materials, and the approach has the potential to revolutionise the targeted design of materials. This will also be an opportunity to train a PhD student in the theory and practice of INS spectroscopy, including subsequent analysis and interpretation of the data.
DOI: 10.5286/isis.e.rb2220449-2
title: An exploration of the vibrational properties of amorphous energetic materials using Inelastic Neutron Scattering
DOI: 10.5286/isis.e.rb2310311
title: Investigation of local magnetic moment fluctuations and their correlation with topological insulating behaviour of transition metal doped Sb2Te3

description: While a magnetic topological Insulator (MTI) has enormous application potential, the retention of magnetism in a topological insulator (TI) is challenging. Transition metal (TM) dopants can be used to modify the defect concentration and induce disorder in the TI, Sb2Te3. Our measurements reveal that the hole (major carrier) contribution is supressed by TM (=Fe, Co, Ni) doping in pristine Sb2Te3. The higher resistivity of all TM doped samples, viz, Sb1.97TM0.03Te3 also demonstrates that magnetic doping increases the bulk insulating behaviour of Sb2Te3. A low carrier concentration and high resistivity have been identified as two significant features for retaining TI behaviour. Here, we will exploit Muon spectroscopy to investigate changes in local magnetism and its correlation with TI properties in TM-doped Sb2Te3. Characterizing the both the static and dynamic fluctuations of the magnetic moments will provide new insights into the impact of the TM dopant on the local magnetic structure of a TI material.
DOI: 10.3535/x7d-gb6-e64
title: Astartoseris triquetra (Labill.) N. Kilian, Hand, Hadjik., Christodoulou & Bou Dagh.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310113
title: μSR investigation of Yb2Te5O13: A possible quantum spin-liquid

description: Rare-earth-based systems have recently been widely considered among the leading candidates for realizing novel quantum states such as quantum spin-ice, quantum spin-liquid (QSL), quantum dimer, etc. In rare earths, strong relativistic spin-orbit coupling ties the spin and the orbital angular momentum together, so they form a multiplet of total angular momentum, J, often with large J. In the presence of a crystal electric field (CEF), the (2J + 1)-fold degeneracy of the orbital multiplet is lifted, and the states of the rare-earth ion are split in energy. Among Kramers ions, Yb3+ has been of particular interest as it can generically host interactions leading to quantum fluctuations irrespective of the crystal electric field (CEF) ground state doublet composition. Here, we propose a new QSL candidate, Yb2Te5O13, where Yb3+ ions form dimers in the bc-plane and stack along the a-axis.
DOI: 10.5286/isis.e.rb2310113-1
title: μSR investigation of Yb2Te5O13: A possible quantum spin-liquid

description: Rare-earth-based systems have recently been widely considered among the leading candidates for realizing novel quantum states such as quantum spin-ice, quantum spin-liquid (QSL), quantum dimer, etc. In rare earths, strong relativistic spin-orbit coupling ties the spin and the orbital angular momentum together, so they form a multiplet of total angular momentum, J, often with large J. In the presence of a crystal electric field (CEF), the (2J + 1)-fold degeneracy of the orbital multiplet is lifted, and the states of the rare-earth ion are split in energy. Among Kramers ions, Yb3+ has been of particular interest as it can generically host interactions leading to quantum fluctuations irrespective of the crystal electric field (CEF) ground state doublet composition. Here, we propose a new QSL candidate, Yb2Te5O13, where Yb3+ ions form dimers in the bc-plane and stack along the a-axis.
DOI: 10.5286/isis.e.rb2368038-2
title: Investigation of Structure, Phase Transition and Alkali-ion Dynamics in Pyrochlore-A1+xNbWO6Fx (A = Na+ & K+)
DOI: 10.3535/5es-8hp-ch0
title: Poa versicolor Besser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/ype-rgb-xs0
title: Poa versicolor Besser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310725-1
title: Crystal field excitations and spin wave investigation in NdPt2B11

description: NdPt2B crystallizes in a non-centrosymmetric hexagonal structure. Resistivity, specific heat and susceptibility data reveal three antiferromagnetic transitions at TN1 = 19.5 K, TN2 = 11 K, and a first-order transition at Tm = 9.5 K. Our neutron diffraction study on powder and single crystal samples (with B-11) using D20 and WISH instruments revealed an original ground state. It can be represented as a superposition of three unharmonic spin density waves, combining k=(0,0,1/5), 2k=(0,0,2/5) and k=0 components at 2K, with moments polarized within the (ab)-plane and forming 60- and 120-degrees configuration. The stacking of the moments along the c-axis with the moment direction along the in-plane easy axes of the spin density waves. Interesting the magnetization isotherm for H//a-axis at 2 K and below 2 T exhibits multiple magnetization plateau (five metamagnetic transitions) and saturates above it. It is important to investigate the role of the single ion CEF anisotropy on the magnetic structure and how the spin wave excitations changes across three magnetic transitions. We, therefore, proposed to carry inelastic neutron scattreing investigations on NdPt2B powder sample to investigate the CEF and spin wave energy scale.
DOI: 10.5286/isis.e.rb2368038
title: Investigation of Structure, Phase Transition and Alkali-ion Dynamics in Pyrochlore-A1+xNbWO6Fx (A = Na+ & K+)
DOI: 10.3535/3pc-z35-398
title: Poa versicolor Besser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/p4s-3be-jym
title: Poa versicolor Besser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2310073
title: Topochemical Reduction of Rynersonite-type Niobium and Tantalum Oxides

description: SrM2O6 (M = Nb, Ta) phases adopt rynersonite-type structures, in which pairs of MO6 octahedra share edges to form ‘dimers’. Reaction of SrTa2O6 with LiH reductively inserts lithium into the framework, resulting in a change in crystal symmetry (Pnma to P21/n) yielding a phase in which there are two crystallographically distinct types of M-M dimer: one with a short Ta-Ta distance (2.71Å) and one with a long Ta-Ta distance (3.15Å). Thermogravimetric data are consistent with a formula of LiSrTa2O6, suggesting that a mixed valent Ta4+/Ta5+ phase has been prepared. We believe the short Ta-Ta contact is the first example of a Ta-Ta bond in an extended oxide. Lithiation of SrNb2O6, SrNbTaO6 and CaTa2O6 leads to qualitatively similar materials. We propose to collect neutron powder diffraction data from the SrM2O6 and lithiated LiSrM2O6 phases to establish their crystal structures so we can better understand the electronic states of the materials.
DOI: 10.5286/isis.e.rb2310073-1
title: Topochemical Reduction of Rynersonite-type Niobium and Tantalum Oxides

description: SrM2O6 (M = Nb, Ta) phases adopt rynersonite-type structures, in which pairs of MO6 octahedra share edges to form ‘dimers’. Reaction of SrTa2O6 with LiH reductively inserts lithium into the framework, resulting in a change in crystal symmetry (Pnma to P21/n) yielding a phase in which there are two crystallographically distinct types of M-M dimer: one with a short Ta-Ta distance (2.71Å) and one with a long Ta-Ta distance (3.15Å). Thermogravimetric data are consistent with a formula of LiSrTa2O6, suggesting that a mixed valent Ta4+/Ta5+ phase has been prepared. We believe the short Ta-Ta contact is the first example of a Ta-Ta bond in an extended oxide. Lithiation of SrNb2O6, SrNbTaO6 and CaTa2O6 leads to qualitatively similar materials. We propose to collect neutron powder diffraction data from the SrM2O6 and lithiated LiSrM2O6 phases to establish their crystal structures so we can better understand the electronic states of the materials.
DOI: 10.5286/isis.e.rb2310725
title: Crystal field excitations and spin wave investigation in NdPt2B11

description: NdPt2B crystallizes in a non-centrosymmetric hexagonal structure. Resistivity, specific heat and susceptibility data reveal three antiferromagnetic transitions at TN1 = 19.5 K, TN2 = 11 K, and a first-order transition at Tm = 9.5 K. Our neutron diffraction study on powder and single crystal samples (with B-11) using D20 and WISH instruments revealed an original ground state. It can be represented as a superposition of three unharmonic spin density waves, combining k=(0,0,1/5), 2k=(0,0,2/5) and k=0 components at 2K, with moments polarized within the (ab)-plane and forming 60- and 120-degrees configuration. The stacking of the moments along the c-axis with the moment direction along the in-plane easy axes of the spin density waves. Interesting the magnetization isotherm for H//a-axis at 2 K and below 2 T exhibits multiple magnetization plateau (five metamagnetic transitions) and saturates above it. It is important to investigate the role of the single ion CEF anisotropy on the magnetic structure and how the spin wave excitations changes across three magnetic transitions. We, therefore, proposed to carry inelastic neutron scattreing investigations on NdPt2B powder sample to investigate the CEF and spin wave energy scale.
DOI: 10.3535/cak-bkz-cv4
title: Poa versicolor Besser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/n1j-7sl-7sw
title: Poa versicolor Besser

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220441
title: Neutron Scattering study of iron-containing starch based hard carbons
DOI: 10.5286/isis.e.rb2220441-1
title: Neutron Scattering study of iron-containing starch based hard carbons
DOI: 10.5286/isis.e.rb2320267-1
title: The Back-End-Of-Line (BEOL) Compatible Antiferromagnet PtMn

description: Back-end-of-line (BEOL) processes in device fabrication often require thermal annealing up to 400°C for 3 hours. This is too high for most antiferromagnetic (AFM) materials, such as the ubiquitous IrMnx alloys, where Mn diffusion happens too readily for BEOL compatibility. Hence, there is significant interest worldwide to identify suitable alternative AFM materials many of which have an L10 structure. One such material is the equiatomic alloy Pt50Mn50. However, this stoichiometry has two stable phases: a low temperature paramagnetic face-centred cubic (fcc) phase and a higher energy face-centred tetragonal (fct) phase, where the latter has the needed AFM ordering. The thermal energy applied during BEOL processes can be used to trigger the phase transformation from fcc to fct. As such the AFM no longer needs to be robust to the BEOL process, as it becomes part of it. Optimising and controlling this phase transition is key – often achieved with long, high temperature anneals. We have used a wide range of experimental techniques to characterise a set of PtMn samples deposited on different seed layers. The seed layers (Pt, Ru and Nb) were chosen so as to manipulate the crystallisation of a PtMn layer through lattice mismatch and intermixing effects. Polarised Neutron Reflectometry (PNR) will be used as a complementary technique to validate or disprove our current interpretation of our results. The collected data would contribute towards a peer reviewed publication.
DOI: 10.3535/e0r-z9a-a0f
title: Carex firmula subsp. tenuis (Poepp. ex Kunth) Jim.Mejías & R.Ridl.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2320267
title: The Back-End-Of-Line (BEOL) Compatible Antiferromagnet PtMn

description: Back-end-of-line (BEOL) processes in device fabrication often require thermal annealing up to 400°C for 3 hours. This is too high for most antiferromagnetic (AFM) materials, such as the ubiquitous IrMnx alloys, where Mn diffusion happens too readily for BEOL compatibility. Hence, there is significant interest worldwide to identify suitable alternative AFM materials many of which have an L10 structure. One such material is the equiatomic alloy Pt50Mn50. However, this stoichiometry has two stable phases: a low temperature paramagnetic face-centred cubic (fcc) phase and a higher energy face-centred tetragonal (fct) phase, where the latter has the needed AFM ordering. The thermal energy applied during BEOL processes can be used to trigger the phase transformation from fcc to fct. As such the AFM no longer needs to be robust to the BEOL process, as it becomes part of it. Optimising and controlling this phase transition is key – often achieved with long, high temperature anneals. We have used a wide range of experimental techniques to characterise a set of PtMn samples deposited on different seed layers. The seed layers (Pt, Ru and Nb) were chosen so as to manipulate the crystallisation of a PtMn layer through lattice mismatch and intermixing effects. Polarised Neutron Reflectometry (PNR) will be used as a complementary technique to validate or disprove our current interpretation of our results. The collected data would contribute towards a peer reviewed publication.
DOI: 10.5286/isis.e.rb2320353-1
title: Hydrogen in Steel Visualized by Energy-resolved Neutron Imaging

description: Visualizing hydrogen distributions via neutron imaging allows for quantification and a better interpretation of the processes involved in hydrogen embrittlement (HE)-assisted fatigue crack growth in austenitic and martensitic steels. Hydrogen is identified from the transmission intensities in both charged and uncharged samples. A gradient of hydrogen within the samples depending on outward diffusion of hydrogen with time is going to be considered. Once the detection limits on IMAT have been established, local hydrogen detection ahead of crack tips will be examined and correlated to fatigue crack growth rates (FCGRs). Samples strained and unstrained are considered for this purpose to understand the effect of straining, thus facilitating an understanding of the relationship between H concentration and FCGRs in steel. A major aspect of this methodical study is to utilize energy-resolved neutron imaging for detection of hydrogen in steel. Correlation of Bragg edge transmission at shorter neutron wavelengths with imaging beyond the Bragg edge cutoff of steel will allow optimizing hydrogen contrast. The outcome of this experiment will advance our mechanistic understanding of hydrogen transport, storage and embrittlement in structural materials
DOI: 10.21233/n39f7z
title: Baker Lake Site 2 pollen surface sample dataset

description: Raw data for the Baker Lake Site 2 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/d03-gnx-ak2
title: Hydrangea serratifolia (Hook. & Arn.) F. Phil.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/pxn-lrt-tw2
title: Tanacetum vulgare L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220251-1
title: Temperature dependent flexible proton transfer systems
DOI: 10.5286/isis.e.rb2220253
title: Low-Temperature Deformation Behaviour of Additively Manufactured Superalloys
DOI: 10.5286/isis.e.rb2220253-1
title: Low-Temperature Deformation Behaviour of Additively Manufactured Superalloys
DOI: 10.5286/isis.e.rb2320353
title: Hydrogen in Steel Visualized by Energy-resolved Neutron Imaging

description: Visualizing hydrogen distributions via neutron imaging allows for quantification and a better interpretation of the processes involved in hydrogen embrittlement (HE)-assisted fatigue crack growth in austenitic and martensitic steels. Hydrogen is identified from the transmission intensities in both charged and uncharged samples. A gradient of hydrogen within the samples depending on outward diffusion of hydrogen with time is going to be considered. Once the detection limits on IMAT have been established, local hydrogen detection ahead of crack tips will be examined and correlated to fatigue crack growth rates (FCGRs). Samples strained and unstrained are considered for this purpose to understand the effect of straining, thus facilitating an understanding of the relationship between H concentration and FCGRs in steel. A major aspect of this methodical study is to utilize energy-resolved neutron imaging for detection of hydrogen in steel. Correlation of Bragg edge transmission at shorter neutron wavelengths with imaging beyond the Bragg edge cutoff of steel will allow optimizing hydrogen contrast. The outcome of this experiment will advance our mechanistic understanding of hydrogen transport, storage and embrittlement in structural materials
DOI: 10.3535/lw5-n9m-6q7
title: Fargesia spathacea Franch.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.3535/vb4-jn6-mej
title: Senecio L.

description: Digital Specimen for the physical specimen hosted at Botanic Garden and Botanical Museum Berlin.
DOI: 10.5286/isis.e.rb2220251
title: Temperature dependent flexible proton transfer systems
DOI: 10.5286/isis.e.rb2320196
title: Developing a general approach to identify the binding locations of adaptor proteins in clathrin cages.

description: Clathrin-mediated endocytosis (CME) at the plasma membrane is a fundamental cellular process by which molecules are selectively imported into cells and it plays a central role in a wide range of eukaryotic processes. A cellular balance of CME is emerging as an important influence on normal differentiation and development, and oncogenesis. Clathrin is key to the assembly of a protein coat which surrounds the invaginating membrane during CME. Coat formation enables selection of vesicle contents, control of vesicle size and coordination of vesicle formation and detachment from the membrane. The choice of cargo and its cellular destination are governed by collective interactions of its corresponding receptor, clathrin and a diverse group of adaptor proteins. Therefore, clathrin-adaptor protein interactions are key to the cell’s ability to respond to changing conditions. To understand this process, we need to visualise and quantify the nature of clathrin-adaptor protein interactions. Achieving this remains a difficult challenge due to the large size and heterogeneity of clathrin cages and the fact that endocytic adaptor proteins often contain large unstructured domains. We propose to combine SANS and cryo-EM data to obtain orthogonal information about adaptor protein binding positions on clathrin cage structures. Success with this project will demonstrate the value of combining SANS and cryo-EM data and have wide impact throughout the structural biology community.