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Quasi-continuous transition from a Fermi liquid to a spin liquid in κ-(ET)2Cu2(CN)3

Author

Listed:
  • Tetsuya Furukawa

    (University of Tokyo
    Tokyo University of Science)

  • Kazuhiko Kobashi

    (University of Tokyo)

  • Yosuke Kurosaki

    (University of Tokyo)

  • Kazuya Miyagawa

    (University of Tokyo)

  • Kazushi Kanoda

    (University of Tokyo)

Abstract

The Mott metal-insulator transition—a manifestation of Coulomb interactions among electrons—is known as a discontinuous transition. Recent theoretical studies, however, suggest that the transition is continuous if the Mott insulator carries a spin liquid with a spinon Fermi surface. Here, we demonstrate the case of a quasi-continuous Mott transition from a Fermi liquid to a spin liquid in an organic triangular-lattice system κ-(ET)2Cu2(CN)3. Transport experiments performed under fine pressure tuning have found that as the Mott transition is approached, the Fermi liquid coherence temperature continuously falls to the scale of kelvins, with a divergent quasi-particle decay rate on the metal side, and the charge gap continuously closes on the insulator side. A Clausius-Clapeyron analysis provides thermodynamic evidence for the extremely weak first-order nature of the transition. These results provide additional support for the existence of a spinon Fermi surface, which becomes an electron Fermi surface when charges are delocalized.

Suggested Citation

  • Tetsuya Furukawa & Kazuhiko Kobashi & Yosuke Kurosaki & Kazuya Miyagawa & Kazushi Kanoda, 2018. "Quasi-continuous transition from a Fermi liquid to a spin liquid in κ-(ET)2Cu2(CN)3," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-017-02679-7
    DOI: 10.1038/s41467-017-02679-7
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    Cited by:

    1. A. Pustogow & Y. Kawasugi & H. Sakurakoji & N. Tajima, 2023. "Chasing the spin gap through the phase diagram of a frustrated Mott insulator," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    2. K. Wakamatsu & Y. Suzuki & T. Fujii & K. Miyagawa & H. Taniguchi & K. Kanoda, 2023. "Thermoelectric signature of quantum critical phase in a doped spin-liquid candidate," Nature Communications, Nature, vol. 14(1), pages 1-6, December.

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