Pseudo-Goldstone mode in altermagnetic $\alpha$-MnTe: high-field electron spin resonance studies

Abstract

We report multi-frequency electron spin resonance spectroscopy studies of $\alpha$-MnTe in magnetic fields up to $16$ T, applied along the easy anisotropy axis. At temperatures below $T_{\mathrm{N}}=310$ K, we observe a single resonance line corresponding to the pseudo-Goldstone mode of the antiferromagnetic resonance (AFMR). This mode exhibits the isotropic behavior with $g_{\mathrm{eff}}=2.01$, consistent with a complete quench of the orbital angular momenta for Mn${}^{2+}$ ions. At low temperatures, the resonance mode is remarkably narrow ($\sim 50$ mT for the full width at the half-maximum at $5$ K). The AFMR mode exhibits substantial broadening with increasing temperature, which can be understood in terms of the magnon-magnon scattering

arXiv commentMain - 6 pages, 5 figures; Supplement - 3 pages

References in corpus (22)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Broken Kramers' degeneracy in altermagnetic MnTe
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Direct observation of altermagnetic band splitting in CrSb thin films
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Spontaneous Magnon Decays
• Multiple-stable anisotropic magnetoresistance memory in antiferromagnetic MnTe
• Large band-splitting in $g$-wave type altermagnet CrSb
• Direct measurement of antiferromagnetic domain fluctuations
• Spin dynamics and transport in gapped one-dimensional Heisenberg antiferromagnets at nonzero temperatures
• X-ray Magnetic Circular Dichroism in Altermagnetic $\alpha$-MnTe
• Chiral-Split Magnon in Altermagnetic MnTe
• Magnon-phonon interactions in magnetic insulators
• Magnetic anisotropy in antiferromagnetic hexagonal MnTe
• Coexistence of Anomalous Hall Effect and Weak Net Magnetization in Collinear Antiferromagnet MnTe
• Spin-Wave Lifetimes Throughout the Brillouin Zone
• Spectrum of a magnetized strong-leg quantum spin ladder
• Monte Carlo Study of Magnetic Resistivity in Semiconducting MnTe
• Spin fluctuations with two-dimensional XY behavior in a frustrated S = 1/2 square-lattice ferromagnet
• Low Temperature Dynamics of Magnons in a Spin-1/2 Ladder Compound
• Lifetime of Gapped Excitations in a Collinear Quantum Antiferromagnet
• Antiferromagnetic resonance in $\alpha$-MnTe