Incommensurate magnetic structure of CrAs at low temperatures and high pressures.

ABSTRACT: The magnetic structure of chromium arsenide CrAs is studied with neutron powder diffraction at ambient pressure in the temperature range 1.5-300 K as well as with neutron single-crystal diffraction at 2 K and 0.12 GPa. The material undergoes an anti-isostructural phase transition at T_N = 267 K and atmospheric conditions, in which both orthorhombic phases have the same space-group symmetry (Pnma, Z = 4) but different distortions of the parent hexagonal structure of the NiAs type (P6₃/mmc, Z = 2). The magnetic structure below T_N is incommensurate with the propagation vector k = (0, 0, k_c). At ambient pressure, the component k_c decreases from k_c = 0.3807 (7) at 260 K to k_c = 0.3531 (6) at 50 K. Below this temperature

SUBMITTER: Eich A 

PROVIDER: S-EPMC10833358 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature