SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Frustrated Magnets
TT 18.9: Talk
Thursday, September 30, 2021, 12:15–12:30, H7
Spin liquid and ferroelectricity close to a quantum critical point in PbCuTe2O6 — •Christian Thurn1, Paul Eibisch1, Arif Ata1, Maximilian Winkler2, Peter Lunkenheimer2, István Kézsmárki2, Ulrich Tutsch1, Yohei Saito1, Steffi Hartmann1, Jan Zimmermann1, Abanoub R. N. Hanna3,4, A. T. M. Nazmul Islam4, Shravani Chillal4, Bella Lake3,4, Bernd Wolf1, and Michael Lang1 — 1PI, Goethe University Frankfurt — 2EP V, University Augsburg — 3IFKP, TU Berlin — 4HZ Berlin
Geometrical frustration among interacting spins combined with strong quantum fluctuations destabilize long-range magnetic order in favor of more exotic states such as spin liquids (SL). While in quasi-two-dimensional (quasi-2D) systems a number of SL candidates were found, in 3D the situation is less favorable due to reduced quantum fluctuations and more relevant competing states. Here we report studies of thermodynamic, magnetic and dielectric properties on single crystalline and pressed-powder samples of PbCuTe2O6, a candidate for a 3D frustrated quantum spin liquid (QSL) [1-3] featuring a hyperkagome lattice. Whereas the low-T properties of the powder are consistent with the proposed QSL state [1-3], a more exotic behaviour is found for the single crystals: they show ferroelectric order at TFE ≈ 1 K, accompanied by strong lattice distortions, and a modified magnetic response − still consistent with a QSL − but with clear indications for quantum critical behaviour.
[1] Koteswararao et al., PRB 90, 035141 (2014)
[2] Khuntia et al., PRL 116, 107203 (2016)
[3] Chillal et al., Nat. Commun. 11, 2348 (2020)