Local magnetism, magnetic order and spin freezing in the 'nonmetallic metal' FeCrAs

Abstract

We present the results of x-ray scattering and muon-spin relaxation (${\mu }^{+}$SR) measurements on the iron-pnictide compound FeCrAs. Polarized non-resonant magnetic x-ray scattering results reveal the 120${}^{\circ }$ periodicity expected from the suggested three-fold symmetric, non-collinear antiferromagnetic structure. ${\mu }^{+}$SR measurements indicate a magnetically ordered phase throughout the bulk of the material below $T_{\mathrm{N}}$=105(5) K. There are signs of fluctuating magnetism in a narrow range of temperatures above $T_{\mathrm{N}}$ involving low-energy excitations, while at temperatures well below $T_{\mathrm{N}}$ behaviour characteristic of freezing of dynamics is observed, likely reflecting the effect of disorder in our polycrystalline sample. Using density functional theory we propose a distinct muon stopping site in this compound and assess the degree of distortion induced by the implanted muon.

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Cited by in corpus (4)

• Spin reorientation in FeCrAs revealed by single-crystal neutron diffraction
• Ab initio modeling and experimental investigation of Fe${}_2$P by DFT and spin spectroscopies
• Magnetic and electric properties of the metallic kagome antiferromagnet CrRhAs
• Enhanced Neel temperature and unusual thermal expansion in flux-grown FeCrAs crystals