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- W2997195587 abstract "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 $J_{rm c}$. Calculations are performed on small clusters under the periodic-boundary conditions. In contrast to the purely triangular case with $J_{rm c}=0$, the specific heat exhibits a characteristic double-peak structure for $J_{rm c}/J gtrsim 0.04$. From the calculation of the entropy and the uniform magnetic susceptibility, it is shown that non-magnetic excitations exist below the magnetic excitation for $J_{rm c}/J gtrsim 0.04$." @default.
- W2997195587 created "2020-01-10" @default.
- W2997195587 creator A5048160827 @default.
- W2997195587 creator A5068173013 @default.
- W2997195587 date "2020-06-03" @default.
- W2997195587 modified "2023-10-16" @default.
- W2997195587 title "Thermodynamic properties of an S=12 ring-exchange model on the triangular lattice" @default.
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