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TT: Fachverband Tiefe Temperaturen
TT 46: Frustrated Magnets: Spin Liquids
TT 46.7: Talk
Thursday, March 30, 2023, 11:00–11:15, HSZ 201
Low temperature phase diagram of PbCuTe2O6 for magnetic fields B || (110) — •Paul Eibisch1, Christian Thurn1, Ulrich Tutsch1, Arif Ata1, Abanoub R. N. Hanna2, A. T. M. Nazmul Islam2, Shravani Chillal2, Bella Lake2, Bernd Wolf1, and Michael Lang1 — 1PI Goethe-University Frankfurt — 2HZ Berlin
The quantum-spin-liquid (QSL) state shows interesting phenomena such as fractional spin excitations and spin entanglement. Here we investigate the spin-liquid-candidate system PbCuTe2O6 where antiferromagnetic interactions among s=1/2 spins lead to a 3D network of triangles similar to the hyper-Kagome lattice. While first experiments on polycrystalline samples, were found to be consistent with the QSL state [1], a recent study on single crystals showed a far more complex scenario including a ferroelectric transition at T = 1 K with strong lattice distortions and a quantum critical behaviour close to B = 0 T [2]. For the present study we combine thermodynamic, dielectric and magnetic experiments to investigate the field- and temperature phase diagram of PbCuTe2O6 for fields up to B=14.5 T parallel to the [110] direction. In addition to the ferroelectric state we find a structurally distorted phase which coincides with the ferroelectric state at low fields but splits above B=6 T as well as a long-range magnetically ordered phase for fields B>11 T. Based on our experimental results we discuss how the elastic, dielectric and magnetic degrees of freedom are coupled.
[1] S. Chillal et al., Nat. Commun. 11, 2348 (2020)
[2] C. Thurn et al., npj Quantum Materials 6:95 (2021)