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MA: Fachverband Magnetismus

MA 5: Heusler compounds, semimetals and oxides (joint session MA/TT)

MA 5.7: Vortrag

Montag, 12. März 2018, 11:00–11:15, EB 301

Physical properties of the CuMnAs alloy - promising material for the antiferromagnetic spintronics — •Frantisek Maca¹, Josef Kudrnovsky¹, Vaclav Drchal¹, Karel Carva², Pavel Balaz², and Ilja Turek² — ¹Institute of Physics ASCR, Praha — ²Faculty of Mathematics and Physics, Charles University, Praha

We have investigated from first principles the role of defects in the antiferromagnetic CuMnAs alloy with tetragonal structure [1]. Mn_Cu, Cu_Mn, Mn-Cu swaps, and vacancies on Mn- and Cu-sublattices are the most probable defects in this material. We have found that the electron correlations play important role in description of the phase stability.
We calculated transport properties for CuMnAs with defects of low formation energies and estimated in-plane resistivity of CuMnAs. Our numerical simulations fitted experiment very well if we assumed concentrations 3.5-5% Mn_Cu or Mn-Cu swaps, much larger concentrations would be needed for Cu_Mn defects or Mn-vacancies. We have estimated also the Neel temperature using the Monte Carlo approach, result agrees reasonably well with the experimentally observed value.
[1] F. Máca, J. Kudrnovský, V. Drchal, K. Carva, P. Baláž, and I. Turek, Phys. Rev. B 96 (2017) 094406.