Berlin 2018 – wissenschaftliches Programm
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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]. MnCu, CuMn, 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% MnCu or Mn-Cu swaps, much larger concentrations would be needed for CuMn 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.