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Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements

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  • Satoshi Yamashita

    (Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.
    RIKEN, Hirosawa 2-1)

  • Takashi Yamamoto

    (Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.)

  • Yasuhiro Nakazawa

    (Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan.
    Institute for Molecular Science, Nishigonaka 38)

  • Masafumi Tamura

    (Faculty of Science and Technology, Tokyo University of Science, Yamazaki, Noda, Chiba 278-8510, Japan.)

  • Reizo Kato

    (RIKEN, Hirosawa 2-1)

Abstract

In frustrated magnetic systems, long-range ordering is forbidden and degeneracy of energy states persists, even at extremely low temperatures. Under certain conditions, these systems form an exotic quantum spin-liquid ground state, in which strongly correlated spins fluctuate in the spin lattices. Here we investigate the thermodynamic properties of an anion radical spin liquid of EtMe3Sb[Pd(dmit)2]2, where dmit represents 1,3-dithiole-2-thione-4,5-dithiolate. This compound is an organic dimer-based Mott insulator with a two-dimensional triangular lattice structure. We present distinct evidence for the formation of a gapless spin liquid by examining the T-linear heat capacity coefficient, γ , in the low-temperature heat capacity. Using comparative analyses with κ-(BEDT-TTF)2Cu2(CN)3, a generalized picture of the new spin liquid in dimer-based organic systems is discussed. We also report anomalous enhancement of γ, produced by a kind of criticality inherent to the Pd(dmit)2 phase diagram.

Suggested Citation

  • Satoshi Yamashita & Takashi Yamamoto & Yasuhiro Nakazawa & Masafumi Tamura & Reizo Kato, 2011. "Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements," Nature Communications, Nature, vol. 2(1), pages 1-6, September.
    • Handle: RePEc:nat:natcom:v:2:y:2011:i:1:d:10.1038_ncomms1274
    DOI: 10.1038/ncomms1274
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