A5069945957- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Rare-earth and actinide compounds
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Ferroelectric and Piezoelectric Materials
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Crystal Structures and Properties
- Heusler alloys: electronic and magnetic properties
- Solid-state spectroscopy and crystallography
- Perovskite Materials and Applications
- Iron-based superconductors research
- Shape Memory Alloy Transformations
- Magnetic Properties of Alloys
- Thermal Expansion and Ionic Conductivity
- High-pressure geophysics and materials
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Inorganic Chemistry and Materials
- Theoretical and Computational Physics
- Magnetic confinement fusion research
- Magnetism in coordination complexes
Rutherford Appleton Laboratory
2016-2025
ISIS Neutron and Muon Source
2022-2025
Research Complex at Harwell
2018-2024
National Institute for Materials Science
2023
University of Oxford
2023
Bhabha Atomic Research Centre
2023
Homi Bhabha National Institute
2023
Science and Technology Facilities Council
2018-2023
Didcot Community Hospital
2018-2020
Oxfam
2019
Hybrid halide perovskites represent one of the most promising solutions toward fabrication all solid nanostructured solar cells, with improved efficiency and long-term stability. This article aims at investigating structural properties iodide/chloride mixed-halide correlating them their photovoltaic performances. We found out that, independent components ratio in precursor solution, Cl incorporation an iodide-based structure, is possible only relatively low concentration levels (below 3–4%)....
By establishing magnetic order in a square lattice compound, we introduce the first “new fermion.”
Understanding structural responses of metal–organic frameworks (MOFs) to external stimuli such as the inclusion guest molecules and temperature/pressure has gained increasing attention in many applications, for example, manipulation manifesto smart materials gas storage, energy controlled drug delivery, tunable mechanical properties, molecular sensing, name but a few. Herein, neutron synchrotron diffractions along with Rietveld refinement density functional theory calculations have been used...
$\text{GdRu}_{\text{2}}\text{Si}_{\text{2}}$ is a centrosymmetric magnet in which skyrmion lattice has recently been discovered. Here, we investigate the magnetic structure of zero field ground state using neutron diffraction on single crystal and polycrystalline $^{\text{160}}\text{GdRu}_{\text{2}}\text{Si}_{\text{2}}$. In addition to observing principal propagation vectors $\mathbf{q}_{1}$ $\mathbf{q}_{2}$, discover higher order satellites, notably $\mathbf{q}_{1} + 2\mathbf{q}_{2}$. The...
The lattice parameters of monoclinic β-Ga2O3 were determined by powder diffraction in a wide temperature range. experiments provide quantitative evaluation the thermal expansion unit cell. It was observed that cell is not isotropic. These data are great technological interest for deposition films on foreign substrates as well different materials (such GaN) Ga2O3 substrates.
Double corundum-related polar magnets are promising materials for multiferroic and magnetoelectric applications in spintronics. However, their design synthesis is a challenge, coupling has only been observed Ni3TeO6 among the known double corundum compounds to date. Here we address high-pressure of new antiferromagnetic derivative Mn2MnWO6, which adopts Ni3TeO6-type structure with low temperature first-order field-induced metamagnetic phase transitions (T N = 58 K) high spontaneous...
We report an experimental study of the magnetic order and electronic structure transport layered pnictide EuMnSb$_2$, performed using neutron diffraction, angle-resolved photoemission spectroscopy (ARPES), magnetotransport measurements. find that Eu Mn sublattices display antiferromagnetic (AFM) below $T_\mathrm{N}^\mathrm{Eu} = 21(1)$ K $T_\mathrm{N}^\mathrm{Mn} 350(2)$ respectively. The former can be described by A-type AFM with spins aligned along $c$ axis (an in-plane direction), whereas...
NaNiO2 (NNO) has been investigated as a promising sodium-ion battery (NIB) cathode material, but it is limited by degradation-induced capacity fade. On desodiation, NNO forms multiple phases with large superstructures due in part to Na+-ion vacancy ordering, however, their structures are unknown. Here, we report structural solution the Na2/3NiO2 (P/3) de-sodiated phase using combined Rietveld refinement of high-resolution synchrotron X-ray (SXRD) and neutron diffraction (NPD) data, magnetic...
We report on the properties of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>SrTb</a:mi><a:mn>2</a:mn></a:msub><a:msub><a:mi mathvariant="normal">O</a:mi><a:mn>4</a:mn></a:msub></a:mrow></a:math>, a frustrated zigzag ladder antiferromagnet, studied by single crystal neutron diffraction (with polarized neutrons in zero field and unpolarized an applied magnetic field), as well spectroscopy polycrystalline sample. The scattering results are supported single-crystal...
The topological Hall effect (THE) is a hallmark of non-trivial geometric spin arrangement in magnetic metal, originating from finite scalar chirality (SSC). associated Berry phase often consequence non-coplanar structures identified by multiple k-vectors. For single-k however with zero SSC, the emergence signal presents conceptual challenge. Here, we report that fluctuation-driven mechanism involving chiral magnons responsible for observed THE low-symmetry compound, monoclinic Fe3Ga4....
Abstract MAX phases are a family of atomically laminated materials with various potential applications. Mn2GaC is prototype magnetic phase, where complex behaviour arises due to competing interactions. We have resolved the room temperature structure by neutron diffraction from single-crystal thin films and we propose model for low phase. It orders in helical structure, rotation angle that changes gradually between 120° 90° depending on temperature.&#xD;
Abstract Tetrahedrite, Cu 12 Sb 4 S 13 , is an abundant mineral with excellent thermoelectric properties owing to its low thermal conductivity. The electronic and structural origin of the intriguing physical tetrahedrite, including metal‐to‐semiconductor transition (MST), remains largely unknown. This work presents first determination low‐temperature structure tetrahedrite that accounts for unique properties. Contrary prior conjectures, results show trigonal–planar copper cations remain in...
Octahedral distortion in ABO3 perovskite materials is ubiquitous because of the ionic size mismatch between A and B cations, leading to various kinds crystal symmetry. However, such a always results centrosymmetric structures except for covalent bond formation second-order Jahn–Teller (SOJT) effect that occurs with d0 or lone-pair cations. Here, we report an unusual combination layered A-site cation ordering B-site rock salt NaYNiWO6 prepared under high-pressure high-temperature conditions...
Magnetic topological semimetals present open questions regarding the interplay of crystal symmetry, magnetism, band topology, and electron correlations. Ln${\mathrm{Sb}}_{x}{\mathrm{Te}}_{2\text{\ensuremath{-}}x\text{\ensuremath{-}}\ensuremath{\delta}}$ (Ln denotes Lanthanide) is a family square-net-derived that allows compositional control filling, access to different states via an evolving charge density wave (CDW) distortion. Previously studied Gd Ce members containing CDW have shown...
<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>Eu</a:mi><a:mn>5</a:mn></a:msub><a:msub><a:mi>In</a:mi><a:mn>2</a:mn></a:msub><a:msub><a:mi>Sb</a:mi><a:mn>6</a:mn></a:msub></a:mrow></a:math> is a member of family orthorhombic nonsymmorphic rare-earth intermetallics that combines large localized magnetic moments and itinerant exchange with low carrier density perpendicular glide planes. This may result in special topological crystalline (wallpaper fermion) or axion...
Cation ordering in ABO3 perovskites can lead to interesting and useful phenomena such as ferrimagnetism high magnetoresistance by spin polarized conduction Sr2FeMoO6. We used pressures temperatures synthesize the cation ordered AA′BB′O6 CaMnFeReO6, CaMnMnReO6, Ca(Mn0.5Cu0.5)FeReO6. These have columnar A/A′ rocksalt B/B′ orders, found recently discovered double perovskite MnNdMnSbO6, partial Mn/Cu order over tetrahedral square planar A′ sites Ca(Mn0.5Cu0.5)FeReO6 demonstrates that triple is...
Magnetic frustration in ferromagnetic metallic systems is unusual due to the long-range and symmetric nature of exchange interactions. In this work we prove that it possible obtain a highly frustrated phase multisublattices cubic structure through fine-tuning magnetic This peculiar state achieved Ni-Mn-(In, Sn) Heusler alloys results effective decoupling their two intertwined sublattices. One sublattice ordered below macroscopic Curie temperature (${T}_{C}$) whereas second one remains...
A helix of dipoles In magnetic materials, typically line up parallel or antiparallel to each other. However, more complex orderings, such as helical, can also occur. Khalyavin et al. found that in the material BiCu 0.1 Mn 6.9 O 12 , a helical order be formed out electric rather than dipoles. The harbors an associated structural order, which symmetry analysis suggests might switchable with applied field. Science this issue p. 680
The solid solution Pb1-xSrxMnBO4 is reported with an orthorhombic, Pnma, structure throughout; here studies on compounds x = 0, 0.5, and 1 are described. contains chains of MnO6 octahedra that exhibit intra-chain ferromagnetic (FM) order at low temperatures. Neutron powder diffraction (NPD) reveals a dominant FM in PbMnBO4 (Tc 30 K), whereas SrMnBO4 primarily antiferromagnetic (AFM) TN 16 K; the difference related to link between involves BO3 groups. has its moment along but also previously...
A topological magnetic material showcases a multitude of intriguing properties resulting from the compelling interplay between topology and magnetism. These include notable phenomena such as large anomalous Nernst effect (ANE), an Hall (AHE), (THE). In most cases, transport are prevalent at temperatures considerably lower than room temperature, presenting challenge for practical applications. However, noncollinear ferromagnetic (FM) LaMn
Magnetic structures of metastable perovskites ScCrO3, InCrO3 and TlCrO3, stabilized under high-pressure high-temperature conditions, have been studied by neutron powder diffraction. Similar to the other orthochromites LnCrO3 (Ln=lanthanide or Y), these materials crystallize into orthorhombic structure with Pnma10 symmetry. The spin configuration has found be C-type, contrasting G-type usually observed in LnCrO3. First-principles calculations demonstrate that Ctype ScCrO3 is attributed a...
Schematic exchange bias and a vertical magnetization shift, originating from the <italic>mGM4</italic>+ magnetic structure in antiperovskites.