Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.26: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Low temperature thermodynamic properties of the quantum spin liquid candidate YbMgGaO₄ — •Sebastian Bachus, Yoshifumi Tokiwa, Andreas Wörl, Yuesheng Li, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, Germany

A quantum spin liquid (QSL) is a new state of matter which shows no ordering of its magnetic moments even at lowest temperatures. It has attracted a lot of attention in the last years due to its exotic behaviour as well its relevance for high temperature superconductors [1].
Recently, the very promising QSL candidate YbMgGaO₄ has been found, where the Yb³⁺-ions form a triangular lattice. Heat capacity and Muon spin relaxation measurements down to 0.05 K provide evidence for the formation of a U(1) QSL ground state [2-4].
Since the antiferromagnetic coupling constant J is in the order of 1 K, further investigations of the low temperature properties are crucial for a better understanding of this compound.
Here, we report various low temperature measurements of specific heat, thermal expansion and magnetostriction down to 40 mK.

[1] P. A. Lee, Rep. Prog. Phys., 71 (2008)

[2] Y. Li et al., Sci. Rep., 5, 16419 (2015)

[3] Y. Li et al., Phys. Rev. Lett., 115, 167203 (2015)

[4] Y. Li et al., Phys. Rev. Lett., 117, 097201 (2016)