Paramagnetic phase of MnTe2: complete one phonon Raman spectrum
Abstract
In this study we present a complete first-order Raman scattering spectrum of paramagnetic phase of MnTe2- a material, where new type of spin texture induced by noncoplanar antiferromagnetic ordering below the Néel temperature (TN ≈ 90 K) gives rise to unconventional scenario of magnetism. Basic properties of all five phonon modes (Ag, Eg and three Tg) predicted by the group theory have been successfully approached through polarization, excitation and temperature dependent measurements. In particular, the ever-missing phonon mode of Tg symmetry has been unambiguously resolved in the room temperature Raman spectrum at approximately 107 cm−1, just 1.5 cm−1 higher in frequency compared to the Eg mode. Density functional theory calculations reproduce the observed Raman-active phonon spectrum and support the assignment of all five first-order Raman modes, including the near-degeneracy of the Eg and one of the Tg vibrations. The calculations further reveal a dense manifold of low-energy antiferromagnetic spin configurations, separated from the ground state by only a few meV per formula unit. Furthermore, strong signals of inelastically scattered light from the paramagnetic (PM) phase of MnTe2 were acquired with long wavelength excitations, i.e. 633 nm and 785 nm, revealing the 2Ag overtone at approx. 360 cm−1. The enhanced absorption of the light in the near infrared range could be a putative reason behind the anomalous angular dependence of scattered intensity of the highest frequency Tg phonon mode (183 cm−1) measured in PM MnTe2 with parallelly aligned polarizers. Finally, upon cooling just below the TN, the measured properties of phonons remained basically unperturbed by the incipient long-range antiferromagnetic ordering.
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BibTeX
@misc{palasyuk2026paramagnetic,
title = {{Paramagnetic phase of MnTe$_2$: complete one phonon Raman spectrum}},
author = {Taras Palasyuk and Dominik Kurzydłowski and Ashutosh S. Wadge and Rajmund Bacewicz and Madhavi H. Dalsaniya and Michał Wierzbicki and Daniel Jastrzebski and Andrzej Wiśniewski and Wojciech Szuszkiewicz and Igor Antoniazzi and Bruno Camargo and Maciej R. Molas and Adam Babiński and Krzysztof Zberecki and Cezariusz Jastrzebski},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.28844},
eprint = {2610.28844},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.28844},
}
RIS
TY - UNPB
TI - Paramagnetic phase of MnTe_2: complete one phonon Raman spectrum
AU - Taras Palasyuk
AU - Dominik Kurzydłowski
AU - Ashutosh S. Wadge
AU - Rajmund Bacewicz
AU - Madhavi H. Dalsaniya
AU - Michał Wierzbicki
AU - Daniel Jastrzebski
AU - Andrzej Wiśniewski
AU - Wojciech Szuszkiewicz
AU - Igor Antoniazzi
AU - Bruno Camargo
AU - Maciej R. Molas
AU - Adam Babiński
AU - Krzysztof Zberecki
AU - Cezariusz Jastrzebski
PY - 2026
DA - 2026/10/20
PB - arXiv
DO - 10.48550/arxiv.2610.28844
UR - https://arxiv.org/abs/2610.28844
AB - In this study we present a complete first-order Raman scattering spectrum of paramagnetic phase of MnTe_2- a material, where new type of spin texture induced by noncoplanar antiferromagnetic ordering below the Néel temperature (T_N ≈ 90 K) gives rise to unconventional scenario of magnetism. Basic properties of all five phonon modes (A_g, E_g and three T_g) predicted by the group theory have been successfully approached through polarization, excitation and temperature dependent measurements. In particular, the ever-missing phonon mode of T_g symmetry has been unambiguously resolved in the room temperature Raman spectrum at approximately 107 cm^−1, just 1.5 cm^−1 higher in frequency compared to the E_g mode. Density functional theory calculations reproduce the observed Raman-active phonon spectrum and support the assignment of all five first-order Raman modes, including the near-degeneracy of the E_g and one of the T_g vibrations. The calculations further reveal a dense manifold of low-energy antiferromagnetic spin configurations, separated from the ground state by only a few meV per formula unit. Furthermore, strong signals of inelastically scattered light from the paramagnetic (PM) phase of MnTe_2 were acquired with long wavelength excitations, i.e. 633 nm and 785 nm, revealing the 2A_g overtone at approx. 360 cm^−1. The enhanced absorption of the light in the near infrared range could be a putative reason behind the anomalous angular dependence of scattered intensity of the highest frequency T_g phonon mode (183 cm^−1) measured in PM MnTe_2 with parallelly aligned polarizers. Finally, upon cooling just below the T_N, the measured properties of phonons remained basically unperturbed by the incipient long-range antiferromagnetic ordering.
ER -