Year: 2026
Type: article
Abstract: We report on antiferromagnetic resonance experiments in bulk tetragonal NaMnAs -- a room-temperature antiferromagnetic semiconductor. Our results corroborate previous ab initio studies, which propose that NaMnAs is an easy-axis antiferromagnet with the Néel vector oriented along the tetragonal axis. At $ B = 0 $, we find a single antiferromagnetic resonance line at 7 meV and associate it with a doubly degenerate ($ k = 0 $) magnon mode. Its energy softens considerably with increasing $ T $, but remains clearly visible in the data up to room temperature. From the experimental data, we estimate the single-ion anisotropy of the Mn ions in NaMnAs in the range 0.1-0.2 meV, a value that is relatively large compared to other manganese-based antiferromagnets.
DOI: 10.1103/q9xw-gc4m
Institutions: Centre National de la Recherche Scientifique, Charles University, Laboratoire National des Champs Magnétiques Intenses, Czech Academy of Sciences, FZU - Institute of Physics of the Czech Academy of Sciences, University of Fribourg, Roma Tre University, Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, Sapienza University of Rome, Aix-Marseille Université
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7167455566