TY  - JOUR
A1  - Christian Thurn, 
A1  - Eibisch, Paul
A1  - Ata, Arif
A1  - Winkler, Maximilian
A1  - Lunkenheimer, Peter
A1  - Kézsmárki, István
A1  - Tutsch, Ulrich
A1  - Saito, Yohei
A1  - Hartmann, Steffi
A1  - Zimmermann, Jan
A1  - R. N. Hanna, Abanoub
A1  - Islam, A. T. M. Nazmul
A1  - Chillal, Shravani
A1  - Lake, Bella
A1  - Wolf, Bernd
A1  - Lang, Michael
T1  - Spin liquid and ferroelectricity close to a quantum critical point in PbCuTe2O6
T2  - npj quantum materials
N2  - 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. By following this guiding principle, a number of spin liquid candidate systems were identified in quasi-two-dimensional (quasi-2D) systems. For 3D, however, the situation is less favorable as quantum fluctuations are reduced and competing states become more relevant. Here we report a comprehensive study of thermodynamic, magnetic and dielectric properties on single crystalline and pressed-powder samples of PbCuTe2O6, a candidate material for a 3D frustrated quantum spin liquid featuring a hyperkagome lattice. Whereas the low-temperature properties of the powder samples are consistent with the recently proposed quantum spin liquid state, an even more exotic behavior is revealed for the single crystals. These crystals show ferroelectric order at TFE ≈ 1 K, accompanied by strong lattice distortions, and a modified magnetic response—still consistent with a quantum spin liquid—but with clear indications for quantum critical behavior.
KW  - Ferroelectrics and multiferroics
KW  - Magnetic properties and materials
KW  - Phase transitions and critical phenomena
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/69549
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-695495
SN  - 2397-4648
N1  - Work done at Goethe University Frankfurt was supported by the German Science Foundation (DFG) through the SFB/TR 288 (ID 422213477). Work done at the University of Augsburg was supported by the DFG via the SFB/TR 80 (ID 107745057).
N1  - Open Access funding enabled and organized by Projekt DEAL.
N1  - All the raw and derived data that support the findings of this study are available from the authors upon reasonable request.
VL  - 6
IS  - art. 95
SP  - 1
EP  - 7
PB  - Nature Publishing Group
CY  - [London]
ER  -