Quantum spin liquid in the spin- 1/2 triangular antiferromagnet EtMe3Sb[Pd(dmit)2]2
Abstract
The family of layered organic salts X[Pd(dmit)2]2 are Mott insulators and form scalene-triangular spin- 1/2 systems. Among them, EtMe3Sb[Pd(dmit)2]2 has a nearly regular-triangular lattice. We have investigated the spin state of this salt by C13-NMR and static susceptibility measurements. The temperature dependence of the susceptibility is described as that of a regular-triangular antiferromagnetic spin- 1/2 system with an exchange interaction J=220-250K . The C13-NMR 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.
- Publication:
-
Physical Review B
- Pub Date:
- March 2008
- DOI:
- Bibcode:
- 2008PhRvB..77j4413I
- Keywords:
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- 75.10.Jm;
- 75.45.+j;
- 76.60.-k;
- Quantized spin models;
- Macroscopic quantum phenomena in magnetic systems;
- Nuclear magnetic resonance and relaxation