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Title: Ground-state energy of biquadratic spin systems (S=3/2) in the (1/z)1-approximation
Authors: Błaszczak, E.
Aksamit, Jan
Franek, A.
Keywords: spin kwantowy; modele spinowe; fale spinowe; antyferromagnetyzm
Issue Date: 2003
Citation: Acta Physica Polonica A, Vol. 103, nr 4 (2003), s. 403-414
Abstract: Corrections to the molecular-field ground- state energies of the Heisenberg model with isotropic biquadrati c 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 numb er of spins interacting with any given spin) . The present results for the antiferri- and antiferromagnetic phases complete the previously obtained data for the antiquadrupolar, ferriand ferromagnetic phases. From among the boundaries between different ground states only that b etw een the antiferri- and antiferromagnetic phases is shifted with respect to its molecular-field value.
ISSN: 0587-4246
Appears in Collections:Artykuły (WNŚiT)

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