Quantum spin liquid in the spin-12 triangular antiferromagnet EtMe3Sb[Pd(dmit)2]2

T. Itou, A. Oyamada, S. Maegawa, M. Tamura, and R. Kato
Phys. Rev. B 77, 104413 – Published 11 March 2008

Abstract

The family of layered organic salts X[Pd(dmit)2]2 are Mott insulators and form scalene-triangular spin-12 systems. Among them, EtMe3Sb[Pd(dmit)2]2 has a nearly regular-triangular lattice. We have investigated the spin state of this salt by C13NMR and static susceptibility measurements. The temperature dependence of the susceptibility is described as that of a regular-triangular antiferromagnetic spin-12 system with an exchange interaction J=220250K. The C13NMR measurements reveal that there is no indication of either spin ordering/freezing or an appreciable spin gap down to 1.37K, which is lower than 1% of J. This result strongly suggests that this system is in the quantum spin-liquid state with no appreciable spin gap, which has been long sought after.

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  • Received 1 August 2007

DOI:https://doi.org/10.1103/PhysRevB.77.104413

©2008 American Physical Society

Authors & Affiliations

T. Itou1, A. Oyamada1, S. Maegawa1, M. Tamura2, and R. Kato2

  • 1Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
  • 2Condensed Molecular Materials Laboratory, RIKEN and JST-CREST, Wako-shi, Saitama 351-0198, Japan

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Issue

Vol. 77, Iss. 10 — 1 March 2008

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