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Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements
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Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements
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Journal Article
Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements
2011
Overview
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 EtMe
3
Sb[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)
2
Cu
2
(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.
Frustrated magnetic systems can form an exotic quantum spin-liquid ground state, in which strongly correlated spins fluctuate in the spin lattices. Here, the low-temperature electronic state of a charge-transfer compound is found to form a gapless spin liquid.
Publisher
Nature Publishing Group UK,Nature Publishing Group
