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Ground-State Energy of Biquadratic Spin Systems (S=3/2) in the (1/z)^1-Approximation

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Błaszczak E., Aksamit J., Franek A.
Acta Physica Polonica A
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2003
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vol. 103
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issue 4
403-414
EN
Corrections to the molecular-field ground-state energies of the Heisenberg model with isotropic biquadratic interactions (spin S=3/2) are calculated in the (1/z)^1-approximation using the diagrammatic technique based on the Wick reduction theorem (z is the number of spins interacting with any given spin). The present results for the antiferri- and antiferromagnetic phases complete the previously obtained data for the antiquadrupolar, ferri- and ferromagnetic phases. From among the boundaries between different ground states only that between the antiferri- and antiferromagnetic phases is shifted with respect to its molecular-field value.
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