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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Takayuki Isono & Taichi Terashima & Kazuya Miyagawa & Kazushi Kanoda & Shinya Uji, 2016. "Quantum criticality in an organic spin-liquid insulator κ-(BEDT-TTF)2Cu2(CN)3," Nature Communications, Nature, vol. 7(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13494
    DOI: 10.1038/ncomms13494
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