This title appears in the Scientific Report :
2023
Please use the identifier:
http://hdl.handle.net/2128/34538 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.jpcs.2023.111436 in citations.
Anti-isostructural phase transition and twinning in CrAs at low temperatures and high pressures
Anti-isostructural phase transition and twinning in CrAs at low temperatures and high pressures
Chromium arsenide CrAs (Pnma, Z = 4) is studied with synchrotron single-crystal diffraction in diamond anvil cells at high-pressures and low temperatures to examine its structural evolution across the boundary (TN) between the antiferromagnetic (AF) and paramagnetic (PM) states. Compressing CrAs acr...
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Personal Name(s): | Grzechnik, Andrzej (Corresponding author) |
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Dmitriev, Vladimir / Hanfland, Michael / Geise, Tobias / Shahed, Hend / Friese, Karen | |
Contributing Institute: |
JCNS-4; JCNS-4 Streumethoden; JCNS-2 Heinz Maier-Leibnitz Zentrum; MLZ JCNS-FRM-II; JCNS-FRM-II |
Published in: | Journal of physics and chemistry of solids, 180 (2023) S. 111436 - |
Imprint: |
New York, NY [u.a.]
Elsevier
2023
|
DOI: |
10.1016/j.jpcs.2023.111436 |
Document Type: |
Journal Article |
Research Program: |
Materials – Quantum, Complex and Functional Materials Jülich Centre for Neutron Research (JCNS) (FZJ) |
Subject (ZB): | |
Link: |
Published on 2023-05-11. Available in OpenAccess from 2024-05-11. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.jpcs.2023.111436 in citations.
Chromium arsenide CrAs (Pnma, Z = 4) is studied with synchrotron single-crystal diffraction in diamond anvil cells at high-pressures and low temperatures to examine its structural evolution across the boundary (TN) between the antiferromagnetic (AF) and paramagnetic (PM) states. Compressing CrAs across TN at low temperatures is equivalent to warming up the material from the AF to PM phases at atmospheric pressure. The phase transition at different conditions is determined from the abrupt changes of the lattice parameters, unit-cell volumes, axial ratios, and interatomic distances. Although, the space group symmetry does not change at TN, the transition is associated with the formation of twin domains. All experimental observations are rationalized with the concept of an anti-isostructural phase transition, in which both orthorhombic phases have the same space group symmetry, but different distortions of the parent hexagonal structure of the NiAs type (P63/mmc, Z = 2). The magneto-structural phase transformation in CrAs is the first example of the anti-isostructural phase transition, in which twinning, as a signature of lost higher rotational symmetry, has been detected. |