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

Schmidt, B.; Thalmeier, P.

doi:10.1016/j.physb.2005.01.429

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

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Schmidt, B.
Burkhard Schmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Thalmeier, P.
Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Schmidt, B., & Thalmeier, P. (2005). Third-order magnetic susceptibility of the frustrated square-lattice antiferromagnet. Physica B-Condensed Matter, 359-361, 1387-1390. doi:10.1016/j.physb.2005.01.429.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0015-2CDB-5

Zusammenfassung

We present results from our analysis of the finite-temperature properties of the spin View the MathML source12J1J1–J2J2 Heisenberg model on a square lattice. The analysis is based on the exact diagonalisation of small clusters with 16 and 20 sites utilising 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 φ=tan-1(J2/J1)φ=tan-1(J2/J1) parameterising the different possible phases of the model, including the large region in the phase diagram with at least one ferromagnetic exchange constant.