Electrical transport properties of bulk tetragonal CuMnAs

J. Volný, D. Wagenknecht, J. Železný, P. Harcuba, E. Duverger–Nedellec, R. H. Colman, J. Kudrnovský, I. Turek, K. Uhlířová, and K. Výborný
Phys. Rev. Materials 4, 064403 – Published 1 June 2020

Abstract

Temperature-dependent resistivity ρ(T) and magnetoresistance are measured in bulk tetragonal phase of antiferromagnetic CuMnAs and are 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.

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  • Received 11 December 2019
  • Revised 20 March 2020
  • Accepted 22 April 2020

DOI:https://doi.org/10.1103/PhysRevMaterials.4.064403

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. Volný1, D. Wagenknecht1, J. Železný2, P. Harcuba3, E. Duverger–Nedellec1, R. H. Colman1, J. Kudrnovský4, I. Turek1, K. Uhlířová1, and K. Výborný2

  • 1Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, Praha 2, CZ-12116, Czech Republic
  • 2Institute of Physics, Academy of Science of the Czech Republic, Cukrovarnická 10, Praha 6, CZ-16253, Czech Republic
  • 3Charles University, Faculty of Mathematics and Physics, Department of Material Physics, Ke Karlovu 5, Praha 2, CZ-12116, Czech Republic
  • 4Institute of Physics, Academy of Science of the Czech Republic, Na Slovance 2, Praha 8, CZ-18221, Czech Republic

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Vol. 4, Iss. 6 — June 2020

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