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Specific heat of quantum Heisenberg model on a triangular lattice with two exchange parameters and its application to He 3 adsorbed on graphite

1992; American Physical Society; Volume: 45; Issue: 21 Linguagem: Inglês

10.1103/physrevb.45.12608

1095-3795

Y. R. Wang,

Quantum many-body systems

The quantum Heisenberg model on a triangular lattice with two exchange parameters, J between nearest-neighbor spins forming a Kagom\'e net, and \ensuremath{\eta}J between spins in the Kagom\'e net and ones at the center of each unit cell of the Kagom\'e net, is studied using the Wigner-Jordan transformation. The specific heat calculated from the model is found to have a double-peak structure when \ensuremath{\eta} is finite but substantially smaller than 1. The experimentally measured specific heat of the second-layer $^{3}\mathrm{He}$ adsorbed on graphite can be explained in terms of our model calculation.