Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 33: Correlated Magnetism – Spin Liquids
TT 33.4: Talk
Wednesday, March 19, 2025, 15:45–16:00, H33
Low-Temperature Features of the Quantum Spin Liquid Candidate PCTO Crystal Structure — •Alexander Mistonov1, Abanoub Hanna2, Elaheh Sadrollahi1, Heidi Savey-Bennett3, Martin von Zimmermann4, Elizabeth Blackburn5, Bella Lake2, and Jochen Geck1 — 1Technische Universität Dresden — 2Helmholtz-Zentrum Berlin — 3The University of Manchester — 4Deutsches Elektronen-Synchrotron DESY — 5Lund University
PbCuTe2O6 (PCTO) is well known as a promising candidate for quantum spin liquid compounds. Magnetic ordering does not occur down to 0.02 K [1]. Additionally, diffuse continua are observed in magnetic spectra [2]. At the same time, heat capacity and dielectric response demonstrate signatures of an order-disorder ferroelectric (FE) transition at ∼ 1 K [3]. According to thermal expansion measurements, this transition is believed to be accompanied by structural changes. We have performed a high-energy single-crystal X-ray diffraction experiment using a dilution refrigerator to investigate it for the first time. We have observed Bragg peaks that are forbidden for the reported high-temperature crystal structure (space group P4132 [4]) and studied their evolution. In the current work, we share our findings from below and above the FE transition.
[1] P. Khuntia et al., Phys. Rev. Lett. 116, 107203 (2016).
[2] S. Chillal et al., Nat. Commun. 11, 2348 (2020).
[3] C. Thurn et. al., npj Quantum Mater. 6, 95 (2021).
[4] A. R. N. Hanna et al., Phys. Rev. Mat. 5, 113401 (2021).
Keywords: quantum spin liquid