Berlin 2024 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 15: Multiferroics and Magnetoelectric Coupling (joint session MA/KFM)
KFM 15.7: Vortrag
Mittwoch, 20. März 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