Matías G. Gonzalez, Bernard Bernu, Laurent Pierre, Laura Messio
SciPost Phys. 12, 112 (2022) ·
published 30 March 2022

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The spin$\frac12$ triangular lattice antiferromagnetic Heisenberg model has been for a long time the prototypical model of magnetic frustration. However, only very recently this model has been proposed to be realized in the Ba$_8$CoNb$_6$O$_{24}$ compound. The groundstate and thermodynamic properties are evaluated from a hightemperature series expansions interpolation method, called "entropy method", and compared to experiments. We find a groundstate energy $e_0 = 0.5445(2)$ in perfect agreement with exact diagonalization results. We also calculate the specific heat and entropy at all temperatures, finding a good agreement with the latest experiments, and evaluate which further interactions could improve the comparison. We explore the spatially anisotropic triangular lattice and provide evidence that supports the existence of a gapped spin liquid between the square and triangular lattices.
Dr Gonzalez: "We provide the response to the..."
in Submissions  report on Groundstate and thermodynamic properties of the spin$\frac{1}{2}$ Heisenberg model on the triangular lattice