Quantum criticality in an organic spin-liquid insulator κ-(BEDT-TTF)2Cu2(CN)3

Takayuki Isono (), Taichi Terashima, Kazuya Miyagawa, Kazushi Kanoda and Shinya Uji ()
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Takayuki Isono: National Institute for Materials Science
Taichi Terashima: National Institute for Materials Science
Kazuya Miyagawa: University of Tokyo
Kazushi Kanoda: University of Tokyo
Shinya Uji: National Institute for Materials Science

Nature Communications, 2016, vol. 7, issue 1, 1-5

Abstract: Abstract A quantum spin-liquid state, an exotic state of matter, appears when strong quantum fluctuations enhanced by competing exchange interactions suppress a magnetically ordered state. Generally, when an ordered state is continuously suppressed to 0 K by an external parameter, a quantum phase transition occurs. It exhibits critical scaling behaviour, characterized only by a few basic properties such as dimensions and symmetry. Here we report the low-temperature magnetic torque measurements in an organic triangular-lattice antiferromagnet, κ-(BEDT-TTF)2Cu2(CN)3, where BEDT-TTF stands for bis(ethylenedithio)tetrathiafulvalene. It is found that the magnetic susceptibilities derived from the torque data exhibit a universal critical scaling, indicating the quantum critical point at zero magnetic field, and the critical exponents, γ=0.83(6) and νz=1.0(1). These exponents greatly constrain the theoretical models for the quantum spin liquid, and at present, there is no theory to explain the values, to the best of our knowledge.

Date: 2016
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DOI: 10.1038/ncomms13494

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