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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 15: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)

KFM 15.7: Talk

Wednesday, March 20, 2024, 16:45–17:00, EB 407

Thermal conductivity in multiferroic CaBaCo4O7 — •Reza Firouzmandi¹, Matthias Gillig¹, Yusuke Tokunaga², Yasujiro Taguchi², Yoshinori Tokura², Christian Hess³, Vilmos Kocsis¹, and Bernd Büchner¹ — ¹IFW-Dresden, Dresden, Germany — ²RIKEN-CEMS, Wako, Japan — ³University of Wuppertal, Wuppertal, Germany

The coupling between the electronic and magnetic degrees of freedoms can lead to exotic transport phenomena in multiferroic materials. Particularly the propagation of charge neutral heat carriers can reveal interesting features in the thermal transport properties. Here, we report the thermal conductivity measurements in multiferroic CaBaCo4O7 which is built up by alternating Kagome and triangular layers of edge sharing CoO4 tetrahedra in mixed valence state. We find anomalies related to the magnetic ordering as well as huge anisotropy in thermal conductivity. Field dependence of the thermal conductivity resembles to that of the ferroelectric polarization. We attribute the anisotropy to the strong phonon scattering on the orthorhombic twinning.

Keywords: heat transport; multiferroics; Swedenborgites