SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Poster: Correlated Electrons II

TT 43.3: Poster

Mittwoch, 29. März 2023, 15:00–18:00, P2/OG3

Dynamic flash method for probing heat transport of quantum magnets — •Maximilian Schiffer1, Xiaochen Hong1, Martin Valldor2, Christian Hess1,3, and Bernd Büchner31Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany — 2Centre for Materials Science and Nanotechnology (SMN), Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway — 3Leibniz-Institute for Solid State and Materials Research (IFW-Dresden), 01069 Dresden, Germany

Transport experiments in principle provide access to the investigation of exotic entropy carrying quasiparticles in quantum magnets, such as spinons in spin chains, triplons in spin ladders and Majorana fermions and visons in spin liquids. Generally, the thermal conductivity of an insulating, magnetic compound consists of phononic and magnetic contributions: κxx = κxx,ph + κxx,mag. Thus, measurement of κxx can offer a fine grasp of the above mentioned quasiparticles, which are currently under hot debate in the field of solid state physics.
Here we address heat transport experiments at elevated temperature which becomes important in materials with sizeable exchange interactions J/kB 100 K. It is well known that standard steady state heat transport measurements are difficult for T ≥ 200 K due to inevitable radiation losses. We present Laser Flash Analysis as a method for avoiding this problem. The method will be introduced, and initial results on various quantum materials will be discussed.

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