Papers › Thermodynamic properties of an S=1/2 ring-exchange model on the triangular lattice
Thermodynamic properties of an S=1/2 ring-exchange model on the triangular lattice
Kazuhiro Seki, Seiji Yunoki
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By using a numerically exact diagonalization technique and a block-extended version of the finite-temperature Lanczos method, we study thermodynamic properties of an S=1/2 Heisenberg model on the triangular lattice with an antiferromagnetic nearest-neighbor interaction J and a four-spin ring-exchange interaction J_c. Calculations are performed on small clusters under the periodic-boundary conditions. In contrast to the purely triangular case with J_c=0, the specific heat exhibits a characteristic double-peak structure for J_c/J ≳0.04. From the calculation of the entropy and the uniform magnetic susceptibility, it is shown that non-magnetic excitations exist below the magnetic excitation for J_c/J ≳0.04.
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