Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.31: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Thermal Transport in Swedenborgite CaBaCo₄O₇ — •Reza Firouzmandi¹, Matthias Gillig¹, Yasujiro Taguchi², Yoshinori Tokura², Yusuke Tokunaga², Vilmos Kocsis¹, and Bernd Büchner¹ — ¹IFW-Dresden, Dresden, Germany — ²RIKEN-CEMS, Wako, Japan

The interplay between electronic, magnetic, and lattice degrees of freedom in multiferroic materials gives rise to novel transport phenomena, including the thermal Hall effect (THE), thermal analog of the Hall effect, where heat flow is deflected under an external magnetic field. Here, we investigate the thermal transport properties of the multiferroic Swedenborgite CaBaCo₄O₇, a compound featuring alternating Kagome and triangular layers of edge-sharing CoO₄ tetrahedra in a mixed valence state. The longitudinal thermal conductivity exhibits anomalies associated with magnetic ordering, while the transverse thermal conductivity (κ_xy) reveals an anomalous thermal Hall effect that vanishes at low temperatures, resembling the magnon thermal Hall effect. These results provide insight into the role of spin-lattice coupling in the thermal transport of frustrated magnetic systems.

Keywords: thermal Hall; multiferroic; insulating magnet; transport; magnetism