Third-order magnetic susceptibility of the frustrated square-lattice antiferromagnet

Details Third-order magnetic susceptibility of the frustrated square-lattice antiferromagnet Third-order magnetic susceptibility of the frustrated square-lattice antiferromagnet

2004-06-11

arxiv.org/abs/cond-mat/0406284v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 figures

Scientific paper

10.1016/j.physb.2005.01.429

We present results from our analysis of the finite-temperature properties of the spin 1/2 $J_{1}$-$J_{2}$ Heisenberg model on a square lattice. The analysis is based on the exact diagonalization of small clusters with 16 and 20 sites utilizing the finite-temperature Lanczos method. In particular, we focus on the temperature dependence of the third-order magnetic susceptibility as a method to resolve the ambiguity of exchange constants. We discuss the entire range of the frustration angle $\phi=\tan^{-1}(J_{2}/J_{1})$ parameterizing the different possible phases of the model, including the large region in the phase diagram with at least one ferromagnetic exchange constant.

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