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Phonon and magnon dynamics across antiferromagnetic transition in 2D layered van der Waals material CrSBr

Authors :
Uykur, E.
Tsirlin, A. A.
Long, F.
Wenzel, M.
Dressel, M.
Mosina, K.
Sofer, Z.
Helm, M.
Zhou, S.
Publication Year :
2024

Abstract

We report temperature-dependent reflectivity spectra of the layered van der Waals magnet CrSBr in the far-infrared region. Polarization-dependent measurements resolve the vibrational modes along the E$\|a$- and $b$-axes and reveal the clear structural anisotropy. While the $a$-axis phonons notably harden on cooling, the $b$-axis phonon frequencies are almost temperature-independent. A phonon splitting due to the antiferromagnetic phase transition is observed for the 180~cm$^{-1}$ $a$-axis vibrational mode, accompanied by a phonon softening below $T_N$. Furthermore, an additional mode with strong magnetic characteristics at $\sim$360~cm$^{-1}$ is identified and attributed to the magnon excitation of CrSBr.<br />Comment: 6 pages, 3 figures

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2405.07853
Document Type :
Working Paper