TY - JOUR
T1 - Gapless spin liquid of an organic triangular compound evidenced by thermodynamic measurements
AU - Yamashita, Satoshi
AU - Yamamoto, Takashi
AU - Nakazawa, Yasuhiro
AU - Tamura, Masafumi
AU - Kato, Reizo
N1 - Funding Information:
We thank Prof. Y. Nishio at Toho University for giving us an opportunity to measure the heat capacity of the EtMe3As[Pd(dmit)2]2 sample. We also thank Prof. H. Nojiri and Dr. Y. Oshima at IMR, Tohoku University for their support in the experiments by a dilution refrigerator. This work was partially supported by a Grant-in-Aid on Priority Area ‘Novel States of Matter Induced by Frustration (22014007)’, a Grant-in-Aid for Scientific Research (No. 20110003) from the Ministry of Education, Science, Sports and Culture of Japan and a Grant-in-Aid for Scientific Research (No. 22340098) from the Japan Society for the Promotion of Science. One of the authors (S.Y.) thanks the fellowship from the Global Education and Research Center for Bio-Environmental Chemistry of Osaka University.
PY - 2011
Y1 - 2011
N2 - 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)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.
AB - 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)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.
UR - http://www.scopus.com/inward/record.url?scp=79955054503&partnerID=8YFLogxK
U2 - 10.1038/ncomms1274
DO - 10.1038/ncomms1274
M3 - Article
C2 - 21505431
AN - SCOPUS:79955054503
SN - 2041-1723
VL - 2
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 275
ER -