We report synthesis of single crystalline NaMnAs, confirm its antiferromagnetic order and characterise the sample by photoemission spectroscopy. The electronic structure was studied using optical transmittance, x-ray and ultraviolet spectroscopy and by theoretical modeling using local density approximation (LDA) extended to LDA+U when Heisenberg model parameters were determined. Optical transmittance measurement have confirmed the theoretical predictions that NaMnAs is a semiconductor. Also the N\'eel temperature was closer determined for the first time from temperature dependence of magnetization, in agreement with our Monte Carlo simulations.
@article{arxiv.2109.03348,
title = {Single crystal studies and electronic structure investigation of a room-temperature semiconductor NaMnAs},
author = {J. Volny and V. Holy and K. Charvatova and M. Veis and M. Vondracek and J. Honolka and E. Duverger-Nedellec and J. Schusser and S. W. D'Souza and J. Minar and J. M. Pientka and A. Marmodoro and K. Vyborny and K. Uhlirova},
journal= {arXiv preprint arXiv:2109.03348},
year = {2022}
}