Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.64: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Thermal and thermal-Hall conductivity study of SrCu2(BO3)2 — •Stevan Arsenijević1, Hanna Dabkowska2, Bruce Gaulin2, Raivo Stern3, and Jochen Wosnitza1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — 2Brockhouse Institute for Materials Research, McMaster University, Hamilton, Canada — 3National Institute of Chemical Physics and Biophysics, Tallinn, Estonia
We present measurements of the thermal and the thermal-Hall conductivity as a function of temperature and magnetic field in the two-dimensional dimer spin system SrCu2(BO3)2. The thermal conductivity in zero magnetic field shows a pronounced peak around 4 K which is ascribed to a spin-gap opening. The low-temperature maximum is strongly suppressed by the application of magnetic field. This result implies that the majority of heat is conducted by phonons which interact with the magnetic excitations. Furthermore, a theoretical study predicted a strong thermal Hall signature due to anisotropies originating from the Dzyaloshinskii-Moriya interactions which lead to a topological character of triplon excitations [1]. Our detailed experimental investigation did not reveal such effect disproving the existence of topological transitions in the triplon band structure.
J. Romhányi, K. Penc, R. Ganesh, Nat. Commun. 6 (2015) 6805