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High-temperature Expansion for Frustrated Magnets: Application to the J1-J2 Model on the BCC Lattice

By Johannes Richter, Patrick Müller, Andre Lohmann and Heinz-Jürgen Schmidt

Abstract

AbstractWe present the high-temperature expansion up to 11th order for the specific heat C and the uniform susceptibility χ0 and up to 9th order for the structure factor SQ of the frustrated spin-half J1-J2 Heisenberg model on the BCC lattice. We consider ferromagnetic as well as antiferromagnetic nearest-neighbor exchange J1 and frustrating antiferromagnetic next-nearest- neighbor exchange J2. We discuss the influence of frustration on the temperature dependence of these quantities. Furthermore, we use the HTE series to determine the critical temperature Tc as a function of the frustration parameter J2

Publisher: The Authors. Published by Elsevier B.V.
Year: 2015
DOI identifier: 10.1016/j.phpro.2015.12.105
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