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Magnetic order in the two-dimensional compass-Heisenberg model

A Green-function theory for the dynamic spin susceptibility in the square-lattice spin-1/2 antiferromagnetic compass-Heisenberg model employing a generalized mean-field approximation is presented. The theory describes magnetic long-range order (LRO) and short-range order (SRO) at arbitrary temperatures. The magnetization, N'eel temperature T_N, specific heat, and uniform static spin susceptibility $χ$ are calculated self-consistently. As the main result, we obtain LRO at finite temperatures in two dimensions, where the dependence of T_N on the compass-model interaction is studied. We find that T_N is close to the experimental value for Ba2IrO4. The effects of SRO are discussed in relation to the temperature dependence of $χ$.

preprint2015arXivOpen access
A. A. VladimirovD. IhleN. M. Plakida
cond-mat.str-el
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A. A. VladimirovD. IhleN. M. Plakida

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