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TT: Fachverband Tiefe Temperaturen
TT 42: Poster: Correlated Electrons I
TT 42.14: Poster
Wednesday, March 29, 2023, 15:00–18:00, P2/OG2
Low energy, mobile excitations in herbertsmithite revealed by magnetothermal conductivity — •Ralf Claus, Jan Bruin, Yosuke Matsumoto, Jürgen Nuss, Masahiko Isobe, and Hidenori Takagi — Max Planck Institute for Solid State Research, Stuttgart, Germany
We report the magnetothermal conductivity k(B) of the Kagome quantum spin liquid candidate herbertsmithite (ZnCu3(OH)6Cl2) in the temperature range from 100 mK to 70 K with applied magnetic fields up to 12 T for heat flow parallel and perpendicular to the Kagome planes. We identify both phonon and magnetic contributions to k and find that the latter is only present for heat flow within the Kagome planes. These 2D magnetic contributions persist down to at least 200 mK, consistent with the presence of low-lying quantum spin liquid excitations with a gapless excitation spectrum.