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arXiv · 2301.03292

Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets

Vilmos Kocsis·Yusuke Tokunaga·Toomas Rõõm·Urmas Nagel·Jun Fujioka·Yasujiro Taguchi·Yoshinori Tokura·Sándor Bordács
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Abstract

Orbital degrees of freedom mediating an interaction between spin and lattice were predicted to raise strong magnetoelectric effect, i.e. realize an efficient coupling between magnetic and ferroelectric orders. However, the effect of orbital fluctuations have been considered only in a few magnetoelectric materials, as orbital degeneracy driven Jahn-Teller effect rarely couples to polarization. Here, we explore the spin-lattice coupling in multiferroic Swedenborgites with mixed valence and Jahn-Teller active transition metal ions on a stacked triangular/Kagome lattice using infrared and dielectric spectroscopy. On one hand, in CaBa$M_4$O$_7$ ($M$ = Co, Fe), we observe strong magnetic order induced shift in the phonon frequencies and a corresponding large change in the dielectric response. Remarkably, as an unusual manifestation of the spin-phonon coupling, the spin-fluctuations reduce the phonon life-time by an order of magnitude at the magnetic phase transitions. On the other hand, lattice vibrations, dielectric response, and electric polarization show no variation at the Néel temperature of CaBaFe$_2$Co$_2$O$_7$, which is built up by orbital singlet ions. Our results provide a showcase for orbital degrees of freedom enhanced magnetoelectric coupling via the example of Swedenborgites.

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Vilmos Kocsis, Yusuke Tokunaga, Toomas Rõõm, Urmas Nagel, Jun Fujioka, Yasujiro Taguchi, Yoshinori Tokura, Sándor Bordács. 2023-01-09. Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets. https://doi.org/10.1103/physrevlett.130.036801

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