Terahertz spin dynamics across Jahn-Teller-like magnetic phase transition

Oleksandr Kovalenko; Nikolay R. Vovk; Roman M. Dubrovin; Roman V. Pisarev; Rostislav V. Mikhaylovskiy

doi:10.1117/12.3022226

11 June 2024 Terahertz spin dynamics across Jahn-Teller-like magnetic phase transition

Oleksandr Kovalenko, Nikolay R. Vovk, Roman M. Dubrovin, Roman V. Pisarev, Rostislav V. Mikhaylovskiy

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Proceedings Volume PC12992, Advances in Ultrafast Condensed Phase Physics IV; PC129920K (2024) https://doi.org/10.1117/12.3022226
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

A Study of THz spin dynamics was performed in a single crystal of antiferromagnetic TbFeO3. Terbium orthoferrite exhibits magnetic phase transition of the Jahn-Teller type resulting in simultaneous rotation of both iron spins and terbium orbital moments and even leading to the emergence of a multiferroic state. A single-cycle THz pulse, generated in the LiNbO3 crystal, is used as a driven torque. The temperature-dependent measurements, across the phase transition region, revealed, that apart from the expected coexistence of two well-distinguished modes of antiferromagnetic resonance at 650 GHz and 450 GHz, near the phase transition temperature, the lower frequency mode bandwidth widens significantly with a subsequent increase of the spectral weight. The widening effect, revealed near the transition temperature, is due to the strong interaction between Tb-Fe sublattices. The interaction is increasing at lower temperatures so that the dynamics, detected in the Fe-sublattice, are mainly governed by the Tb-sublattice. Surprisingly, near the transition point, even lover frequency modes (~150 GHz), assigned to the impurity modes, were observed.

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Oleksandr Kovalenko, Nikolay R. Vovk, Roman M. Dubrovin, Roman V. Pisarev, and Rostislav V. Mikhaylovskiy "Terahertz spin dynamics across Jahn-Teller-like magnetic phase transition", Proc. SPIE PC12992, Advances in Ultrafast Condensed Phase Physics IV, PC129920K (11 June 2024); https://doi.org/10.1117/12.3022226

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KEYWORDS

Magnetism

Ultrafast phenomena

Spin dynamics

Terahertz radiation

Terbium

Angular momentum

Ions

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