cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5286/isis.e.rb2070002
title: quantum criticality derived from the valence fluctuations of YbCu4Ni

description: In the previous works, many good crystals and nice experimental method provided a lot of subjects of the quantum critical phenomena originated from the spin. In these days, the quantum critical phenomena from the novel freedom such as the electric-quadrupole, rattling, and valence are much attracted. The prime candidate is valence. However, to study of quantum critical phenomena derived from valences, there is a large experimental problem of finding actual candidate materials. In YbCu4Ni, the valence fluctuation of Yb ion occurs from the our NQR measurement and the development of quantum fluctuations was observed with decreasing low temperatures. However, the reason for the rapid relaxation is that the intensity of the resonance line is small and it is difficult to perform ultra-low temperature measurement. muSR is suitable because the time scale is faster.
DOI: 10.5286/isis.e.rb2070002-1
title: quantum criticality derived from the valence fluctuations of YbCu4Ni

description: In the previous works, many good crystals and nice experimental method provided a lot of subjects of the quantum critical phenomena originated from the spin. In these days, the quantum critical phenomena from the novel freedom such as the electric-quadrupole, rattling, and valence are much attracted. The prime candidate is valence. However, to study of quantum critical phenomena derived from valences, there is a large experimental problem of finding actual candidate materials. In YbCu4Ni, the valence fluctuation of Yb ion occurs from the our NQR measurement and the development of quantum fluctuations was observed with decreasing low temperatures. However, the reason for the rapid relaxation is that the intensity of the resonance line is small and it is difficult to perform ultra-low temperature measurement. muSR is suitable because the time scale is faster.
DOI: 10.5286/isis.e.rb2010812
title: Proposal to determine the origin of the effects of electric fields on the muon response in composite insulation

description: In the previous proposal we examined the ALC response of components of the complex dielectric under externally applied electric fields (EEF). We saw a shift in the asymmetry at the ALC peak and have proposed two possible cases as to the cause. In one case the electrons left behind when the muon thermalises are affected by the EEF, and in the other a redistribution of the spin density causes a change in the hyperfine coupling. We propose to establish which of these is the cause of the shift seen, or whether it is a combination of both by reversing the EEF direction,and by fully characterizing the ALC spectrum. Once completed this will consolidate our theories as to the origin of the effect of EEF on the dielectric, and provide a sound basis for publication. Additionally, we would like to perform the same experiments at higher fields in order to determine if the trends seen continue.
DOI: 10.5286/isis.e.rb2010812-1
title: Proposal to determine the origin of the effects of electric fields on the muon response in composite insulation

description: In the previous proposal we examined the ALC response of components of the complex dielectric under externally applied electric fields (EEF). We saw a shift in the asymmetry at the ALC peak and have proposed two possible cases as to the cause. In one case the electrons left behind when the muon thermalises are affected by the EEF, and in the other a redistribution of the spin density causes a change in the hyperfine coupling. We propose to establish which of these is the cause of the shift seen, or whether it is a combination of both by reversing the EEF direction,and by fully characterizing the ALC spectrum. Once completed this will consolidate our theories as to the origin of the effect of EEF on the dielectric, and provide a sound basis for publication. Additionally, we would like to perform the same experiments at higher fields in order to determine if the trends seen continue.
DOI: 10.5286/isis.e.rb2010305
title: Unraveling the mystery of the tricritical point in Zr-rich PbZr1-xTixO3

description: The solid solution of lead titanate (PbTiO3) and lead zirconate (PbZrO3), known as PbZr1-xTixO3 (PZT), is commonly used in a wide range of applications because of its high piezoelectric and coupling coefficient. The morphotropic phase boundary (MPB) has been widely studied by lots of researchers including us. Recent study shows tricritical behaviour in the high-Zr (x ~ 0.06) region. Unusual anomalies have been observed with Curie temperature, dielectric constants etc. as a function of composition. Our recent diffuse scattering results on single crystals suggest that the structure here is of lower symmetry than previously thought. In order to investigate the high-temperature and room-temperature structures and phase changes around this tricritical point, we request four days of HRPD time to collect full patterns with x = 0.02, 0.04, 0.05, 0.06, 0.07, 0.08, 0.10 at various temperatures.
DOI: 10.5286/isis.e.rb2010305-1
title: Unraveling the mystery of the tricritical point in Zr-rich PbZr1-xTixO3

description: The solid solution of lead titanate (PbTiO3) and lead zirconate (PbZrO3), known as PbZr1-xTixO3 (PZT), is commonly used in a wide range of applications because of its high piezoelectric and coupling coefficient. The morphotropic phase boundary (MPB) has been widely studied by lots of researchers including us. Recent study shows tricritical behaviour in the high-Zr (x ~ 0.06) region. Unusual anomalies have been observed with Curie temperature, dielectric constants etc. as a function of composition. Our recent diffuse scattering results on single crystals suggest that the structure here is of lower symmetry than previously thought. In order to investigate the high-temperature and room-temperature structures and phase changes around this tricritical point, we request four days of HRPD time to collect full patterns with x = 0.02, 0.04, 0.05, 0.06, 0.07, 0.08, 0.10 at various temperatures.
DOI: 10.5286/isis.e.rb2010305-2
title: Unraveling the mystery of the tricritical point in Zr-rich PbZr1-xTixO3

description: The solid solution of lead titanate (PbTiO3) and lead zirconate (PbZrO3), known as PbZr1-xTixO3 (PZT), is commonly used in a wide range of applications because of its high piezoelectric and coupling coefficient. The morphotropic phase boundary (MPB) has been widely studied by lots of researchers including us. Recent study shows tricritical behaviour in the high-Zr (x ~ 0.06) region. Unusual anomalies have been observed with Curie temperature, dielectric constants etc. as a function of composition. Our recent diffuse scattering results on single crystals suggest that the structure here is of lower symmetry than previously thought. In order to investigate the high-temperature and room-temperature structures and phase changes around this tricritical point, we request four days of HRPD time to collect full patterns with x = 0.02, 0.04, 0.05, 0.06, 0.07, 0.08, 0.10 at various temperatures.
DOI: 10.5286/isis.e.rb2000165
title: Chipir commercial access: Andy Holton

description: Verify the SEE rates of avionic equipment being certified according to EASA CM-AS-004
DOI: 10.5286/isis.e.rb2000165-1
title: Chipir commercial access: Andy Holton

description: Verify the SEE rates of avionic equipment being certified according to EASA CM-AS-004
DOI: 10.5286/isis.e.rb1920660
title: Magnetic field tuning of dynamic spin orbit effects in a honeycomb magnet

description: This is a continuation proposal to probe the magnetic excitations in a Fe-based stacked honeycomb magnet in applied magnetic field. In recent zero-field LET measurements we observed evidence for strong spin-orbit effects manifested in anomalous intensity modulations at low energies attributed to a mixed spin-orbital character of the magnetic moments and gap openings, both at the inter-layer zone boundary and also where Dirac magnon cones are present at the corners of the in-plane hexagonal Brillouin zone. Here we propose to measure the excitations as a function of applied field that drive a transition above 8 T to a phase where the ground-state spin-orbital admixture changes, in order to further probe the spin-orbit effects on the cooperative dynamics and constrain the exchange Hamiltonian.
DOI: 10.5286/isis.e.rb1920660-1
title: Magnetic field tuning of dynamic spin orbit effects in a honeycomb magnet

description: This is a continuation proposal to probe the magnetic excitations in a Fe-based stacked honeycomb magnet in applied magnetic field. In recent zero-field LET measurements we observed evidence for strong spin-orbit effects manifested in anomalous intensity modulations at low energies attributed to a mixed spin-orbital character of the magnetic moments and gap openings, both at the inter-layer zone boundary and also where Dirac magnon cones are present at the corners of the in-plane hexagonal Brillouin zone. Here we propose to measure the excitations as a function of applied field that drive a transition above 8 T to a phase where the ground-state spin-orbital admixture changes, in order to further probe the spin-orbit effects on the cooperative dynamics and constrain the exchange Hamiltonian.
DOI: 10.5286/isis.e.rb2010718
title: Crystal Structures of Silver Bismuthates Synthesized Under High Pressure

description: The silver bismuthate Ag2BiO3 is expected to contain bismuth in the nominal 4+ state, but Bi charge disproportionate in this insulator. A monoclinic distortion from Pnn2 to P2 at ~243 is observed. We explored the highly oxidized AgBiO3 in two phases: ilmenite and a newly synthesized phase at 6 GPa. The Bi-O interactions in all these silver bismuthates effect their properties, which we aim to probe with neutron diffraction. We therefore request 2 days on GEM in order to characterize all three materials. A standard ambient condition diffraction pattern will be sufficient for 1 g samples of AgBiO3 (ilmenite) and AgBiO3 (6 GPa) (~9 hours). As for Ag2BiO3, the diffraction pattern as a function of temperature for a 1 g sample will be measured over the range 10-300 K (~39 hours).
DOI: 10.5286/isis.e.rb2010718-1
title: Crystal Structures of Silver Bismuthates Synthesized Under High Pressure

description: The silver bismuthate Ag2BiO3 is expected to contain bismuth in the nominal 4+ state, but Bi charge disproportionate in this insulator. A monoclinic distortion from Pnn2 to P2 at ~243 is observed. We explored the highly oxidized AgBiO3 in two phases: ilmenite and a newly synthesized phase at 6 GPa. The Bi-O interactions in all these silver bismuthates effect their properties, which we aim to probe with neutron diffraction. We therefore request 2 days on GEM in order to characterize all three materials. A standard ambient condition diffraction pattern will be sufficient for 1 g samples of AgBiO3 (ilmenite) and AgBiO3 (6 GPa) (~9 hours). As for Ag2BiO3, the diffraction pattern as a function of temperature for a 1 g sample will be measured over the range 10-300 K (~39 hours).
DOI: 10.5286/isis.e.rb2000167
title: ISIS@MACH-Investigations on the use of epithermal neutron contrast-enhanced radiography as a diagnostic for reinforced concrete failures.

description: We propose an exploratory, easy-to-setup experiment at VESUVIO aimed at investigating the possibilities offered by epithermal neutrons in the imaging investigation of iron rods into reinforced concrete. The experiment, conducted within the ISIS@MACH framework, will be accompanied by investigation through X-rays and it will be the basis for the future development of a project aimed at the realization of a mobile diagnostic system for the non-destructive, on-site investigation of reinforced concrete artifacts like buildings and bridges.
DOI: 10.5286/isis.e.rb2000167-1
title: ISIS@MACH-Investigations on the use of epithermal neutron contrast-enhanced radiography as a diagnostic for reinforced concrete failures.

description: We propose an exploratory, easy-to-setup experiment at VESUVIO aimed at investigating the possibilities offered by epithermal neutrons in the imaging investigation of iron rods into reinforced concrete. The experiment, conducted within the ISIS@MACH framework, will be accompanied by investigation through X-rays and it will be the basis for the future development of a project aimed at the realization of a mobile diagnostic system for the non-destructive, on-site investigation of reinforced concrete artifacts like buildings and bridges.
DOI: 10.5286/isis.e.rb2010622
title: Distribution of alkane probes in heterogeneous PDMS resins

description: Silicone elastomers are well known to have a network structure, but it is also apparent from AFM studies that there is a larger scale network of densely and sparsely cross-linked regions on a nm scale. We wish to better understand this distribution and its implications for the permeation and distribution of small molecules in such networks. Our first experiment with a surfactant additive in PDMS revealed this heterogeneous structure, but we could not resolve the scattering contributions arising from the PDMS structure, and the long or short-range organisation of the surfactant. Using a series of homologous alkane additives, which have systematically varying entropy and enthalpy of mixing, we will isolate the PDMS structure in terms of densely and sparsely cross-linked regions. This will be invaluable in (i) interpreting data for complex additives and (ii) computational modelling.
DOI: 10.5286/isis.e.rb2010622-1
title: Distribution of alkane probes in heterogeneous PDMS resins

description: Silicone elastomers are well known to have a network structure, but it is also apparent from AFM studies that there is a larger scale network of densely and sparsely cross-linked regions on a nm scale. We wish to better understand this distribution and its implications for the permeation and distribution of small molecules in such networks. Our first experiment with a surfactant additive in PDMS revealed this heterogeneous structure, but we could not resolve the scattering contributions arising from the PDMS structure, and the long or short-range organisation of the surfactant. Using a series of homologous alkane additives, which have systematically varying entropy and enthalpy of mixing, we will isolate the PDMS structure in terms of densely and sparsely cross-linked regions. This will be invaluable in (i) interpreting data for complex additives and (ii) computational modelling.
DOI: 10.5286/isis.e.rb2010450
title: Measurement of vibrational spectra in high-thermal-conductivity ceramics

description: In high-voltage electronics, heat dissipation is a major challenge. Ideally the materials in these devices will have a high thermal conductivity; a property determined by vibrations in the material. In order to improve understanding of these materials and develop better alternatives, it is helpful to have a good theoretical model of these vibrations: available approaches include force-fields, tight-binding and density-functional theory. These simulations may be compared to and calibrated against spectra from vibrational spectroscopy. We propose temperature-dependent measurements of the momentum-dependent vibrational spectra of SiC (an established material) and Ga2O3 (an emerging material) using MAPS, in order to verify and improve simulations of the dynamics in these systems. This is linked to development of the Abins software for simulated INS to support direct-geometry experiments.
DOI: 10.5286/isis.e.rb2010450-1
title: Measurement of vibrational spectra in high-thermal-conductivity ceramics

description: In high-voltage electronics, heat dissipation is a major challenge. Ideally the materials in these devices will have a high thermal conductivity; a property determined by vibrations in the material. In order to improve understanding of these materials and develop better alternatives, it is helpful to have a good theoretical model of these vibrations: available approaches include force-fields, tight-binding and density-functional theory. These simulations may be compared to and calibrated against spectra from vibrational spectroscopy. We propose temperature-dependent measurements of the momentum-dependent vibrational spectra of SiC (an established material) and Ga2O3 (an emerging material) using MAPS, in order to verify and improve simulations of the dynamics in these systems. This is linked to development of the Abins software for simulated INS to support direct-geometry experiments.
DOI: 10.5286/isis.e.rb2010428
title: Entangled states and magnetic order in a J1/J1’ rectangular lattice with oxalate and fluoride bridges

description: Low dimensional and frustrated magnetic systems are a great source of interest theoretically, and one of the experimental challenges is to find real materials that from the magnetic point of view approximate closely to theoretical models. Here we study a system that is a close to ideal two dimensional (2D) rectangular lattice of magnetic atoms (Fe or Co) coupled along different different axial directions by either F or oxalate groups that act to transmit the magnetic interactions within the 2D plane. Neutron powder diffraction indicates a three dimensional (3D) antiferromagnetic order emerging from these isolated (2D) planes, while magnetic susceptibility indicates two dimensional fluctuations above and possibly also below the ordering temperature. We would like to explore further the magnetic behaviour. The presence of F atoms gives added interest from the entangle µ-F states.
DOI: 10.5258/soton/d1541
title: Accompanying materials for: Crowd-composition: exploring the qualities of collective creativity

description: This dataset consists of accompanying materials for the thesis 'Crowd-composition: exploring the qualities of collective creativity' by Joseph Manghan. Provided are video and audio recordings from the live workshops that took place over the course of the project, as well as 'workshop performance packs' that allow others to enact the works themselves.
DOI: 10.5286/isis.e.rb2010428-1
title: Entangled states and magnetic order in a J1/J1’ rectangular lattice with oxalate and fluoride bridges

description: Low dimensional and frustrated magnetic systems are a great source of interest theoretically, and one of the experimental challenges is to find real materials that from the magnetic point of view approximate closely to theoretical models. Here we study a system that is a close to ideal two dimensional (2D) rectangular lattice of magnetic atoms (Fe or Co) coupled along different different axial directions by either F or oxalate groups that act to transmit the magnetic interactions within the 2D plane. Neutron powder diffraction indicates a three dimensional (3D) antiferromagnetic order emerging from these isolated (2D) planes, while magnetic susceptibility indicates two dimensional fluctuations above and possibly also below the ordering temperature. We would like to explore further the magnetic behaviour. The presence of F atoms gives added interest from the entangle µ-F states.
DOI: 10.5286/isis.e.rb2010671
title: Local coordination and vibrational properties of hydride ions in a novel oxide-hydride

description: This proposal requests beamtime on the inelastic neutron scattering spectrometers TOSCA and MAPS to investigate the local coordination and vibrational dynamics of hydride ions in the recently discovered LaxSr4-xNiRuO4H4 (x = 0.5, 1, and 1.5) oxide-hydride phases. Besides being of pure fundamental interest, one of the interests in these materials is their inherent hydride-ion conductivity, which makes them of interest for various technological devices. The aim of the research is to determine how the atomic-scale structure and vibrational dynamics and how it depends on cation doping (x), and relate these properties to the hydride-ion mobility of the materials.
DOI: 10.5286/isis.e.rb2010671-1
title: Local coordination and vibrational properties of hydride ions in a novel oxide-hydride

description: This proposal requests beamtime on the inelastic neutron scattering spectrometers TOSCA and MAPS to investigate the local coordination and vibrational dynamics of hydride ions in the recently discovered LaxSr4-xNiRuO4H4 (x = 0.5, 1, and 1.5) oxide-hydride phases. Besides being of pure fundamental interest, one of the interests in these materials is their inherent hydride-ion conductivity, which makes them of interest for various technological devices. The aim of the research is to determine how the atomic-scale structure and vibrational dynamics and how it depends on cation doping (x), and relate these properties to the hydride-ion mobility of the materials.
DOI: 10.5286/isis.e.rb2010377
title: Investigation of local structure in Ni3+-rich Li ion battery cathode materials

description: LiNi0.8Mn0.1Co0.1O2 (Li NMC 811), LiNi0.6Mn0.2Co0.2O2 (Li NMC 622) and LiNi0.8Co0.15Al0.05O2 (Li NCA) are next generation Li ion battery cathode materials where the main redox active ion is Jahn-Teller active Ni3+. A previous report on the parent material LiNiO2 indicated local ordering of the Ni3+ Jahn-Teller orbitals into trimers at low temperatures, however the impact of the local distortions of the Ni3+ Jahn-Teller orbital on the structure and the subsequent electrochemical performance of these Ni3+ rich materials remains an open question. We propose temperature dependent total scattering measurements on Li NMC 811, Li NMC 622 and Li NCA to investigate the local structure and evolution of the local Jahn-Teller ordering as a function of temperature.
DOI: 10.5286/isis.e.rb2010377-1
title: Investigation of local structure in Ni3+-rich Li ion battery cathode materials

description: LiNi0.8Mn0.1Co0.1O2 (Li NMC 811), LiNi0.6Mn0.2Co0.2O2 (Li NMC 622) and LiNi0.8Co0.15Al0.05O2 (Li NCA) are next generation Li ion battery cathode materials where the main redox active ion is Jahn-Teller active Ni3+. A previous report on the parent material LiNiO2 indicated local ordering of the Ni3+ Jahn-Teller orbitals into trimers at low temperatures, however the impact of the local distortions of the Ni3+ Jahn-Teller orbital on the structure and the subsequent electrochemical performance of these Ni3+ rich materials remains an open question. We propose temperature dependent total scattering measurements on Li NMC 811, Li NMC 622 and Li NCA to investigate the local structure and evolution of the local Jahn-Teller ordering as a function of temperature.
DOI: 10.5286/isis.e.rb1820334-2
title: Structures of metastable water ice XVII with different guests molecules

description: Very recently, we have studied the crystalline structure of the C0-phase H2-filled ice (recovered at room pressure and low temperature) and ice XVII, a new form of ice discovered by our group. This new ice (obtained by heating C0-phase H2-filled ice at about 110 K under dynamic vacuum) is so porous that it can reabsorb H2 and other gases, and release them repetitively. After our first diffraction measurements, several issues remain still unresolved. This proposal aims to study the structure of ice XVII, both empty and with a variable quantity of refilled molecules (D2, Ne, Ar), so solve the open issues about the effect of the guest on the structure, and the possible formation of a proton-ordered form of the empty structure. Data will be analyzed through Rietveld refinement, in order to accurately determine the positions of the atoms in the unit cell.
DOI: 10.5519/qd.ek54z4ra
title: Query on the Natural History Museum Data Portal (data.nhm.ac.uk) (14 records)