Electrical transport properties of bulk tetragonal CuMnAs

Abstract

Temperature-dependent resistivity and magnetoresistance are measured in bulk tetragonal phase of antiferromagnetic CuMnAs and the latter is found to be anisotropic both due to structure and magnetic order. We compare these findings to model calculations with chemical disorder and finite-temperature phenomena included. The finite-temperature ab initio calculations are based on the alloy analogy model implemented within the coherent potential approximation and the results are in fair agreement with experimental data. Regarding the anisotropic magnetoresistance (AMR) which reaches a modest magnitude of 0.12%, we phenomenologically employ the Stoner-Wohlfarth model to identify temperature-dependent magnetic anisotropy of our samples and conclude that the field-dependence of AMR is more similar to that of antiferromagnets than ferromagnets, suggesting that the origin of AMR is not related to isolated Mn magnetic moments.

10+ pages, few minor issues corrected

References in corpus (6)

• Calculating linear response functions for finite temperatures on the basis of the alloy analogy model
• Anisotropic Magnetoresistance components in (Ga,Mn)As
• Field induced density wave in the heavy fermion compound CeRhIn5
• Magnetic order induces symmetry breaking in the single crystalline orthorhombic CuMnAs semimetal
• Physical properties of the tetragonal CuMnAs: a first-principles study
• Molecular beam epitaxy of CuMnAs

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• High-resolution diffraction reveals magnetoelastic coupling and coherent phase separation in tetragonal CuMnAs
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