Single-crystal studies and electronic structure investigation of the room-temperature semiconductor NaMnAs

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Authors	VOLNÝ Jiří CHARVÁTOVÁ Kateřina VEIS Martin HOLÝ Václav VONDRÁČEK Martin HONOLKA Jan DUVERGER-NÉDELLEC Elen SCHUSSER Jakub SOUZA Sunil W. MINÁR Jan PIENTKA James M MARMODORO Alberto VÝBORNÝ Karel UHLÍŘOVÁ Klára
Year of publication	2022
Type	Article in Periodical
Magazine / Source	Physical Review B
MU Faculty or unit	Faculty of Science
Citation
Web	https://arxiv.org/pdf/2109.03348.pdf https://doi.org/10.1103/PhysRevB.105.125204
Doi	http://dx.doi.org/10.1103/PhysRevB.105.125204
Keywords	Antiferromagnetism; Crystal growth; Crystal structure; Density of states; Exchange interaction; Magnetic anisotropy; Magnetic semiconductors; Semiconductors
Description	Synthesis of single-crystalline NaMnAs is reported, and we confirm its high quality by x-ray photoemission spectra. Magnetometry results are consistent with previous findings of antiferromagnetic order. The electronic structure was further studied using optical transmittance and by theoretical modeling using local-density approximation (LDA) extended to LDA + U for the purpose of determining the Heisenberg model parameters. Optical transmittance measurements confirm theoretical predictions that NaMnAs is a semiconductor. The Néel temperature was determined from temperature dependence of susceptibility, in agreement with our Monte Carlo simulations.
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