SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Poster Session: Correlated Electrons
TT 9.21: Poster
Dienstag, 28. September 2021, 13:30–16:00, P
Low-temperature investigation of thermodynamic properties on the spin-liquid candidate system PbCuTe2O6 in various finite fields. — •Paul Eibisch1, Christian Thurn1, Ulrich Tutsch1, Arif Ata1, Abanoub R. N. Hanna2,3, A. T. M. Nazmul Islam3, Shravani Chillal3, Bella Lake3, Bernd Wolf1, and Michael Lang1 — 1PI Goethe-University Frankfurt — 2IFKP, TU Berlin — 3HZ Berlin
The quantum spin liquid is an exotic state of magnetic systems which shows no long-range order down to T = 0 K but instead exhibits persistent spin dynamics with highly entangled spins fluctuating between various degenerate configurations. A favourable route to realize this state is to use geometric frustrations for instance in 2D materials where the spins interact on top of a kagome lattice. In this study we present low-temperature thermodynamic measurements in various fields on the spin-liquid candidate system PbCuTe2O6 showing a Hyper-kagome lattice, a 3D adaptation of the 2D kagome lattice. First investigations on polycrystalline samples supported the spin-liquid character [1], whereas more recent studies revealed an even more exotic behaviour i.e. a ferroelectric phase transition around T = 1 K together with a diverging thermal Grüneisen parameter, indicating proximity to a quantum critical point [2]. Here we show that the magnetic Grüneisen parameter diverges as well, supporting zero-field-quantum-critical behaviour. Further focus of our investigations lies on the field dependence of the ferroelectric transition.
[1] S.Chillal et al., Nat. Commun. 11, 2348 (2020)
[2] C.Thrun et al., arXiv:2103.17175