Abstract
Applying the diagrammatic technique for the more complicated level scheme of spin-one, two-sublattice systems with biquadratic exchange, the elementary excitations for T ǂ 0 are obtained: two pairs of spin waves with double degeneracy in both the antiferromagnetic and the ferriquadrupolar phase, and one pair of quadron waves with two-fold degeneracy in the antiferromagnetic state of the system. Analytical expressions are derived for the zero-point contribution to the ground-state energy and the dipole as well as quadrupole reductions in the framework of spin- and quadron-wave theory for antiferromagnetic and ferriquadrupolar phases. The dipole and quadrupole reductions in the antiferromagnetic case for the quadratic lattice are discussed in more detail. In the calculations use has been made of the (1/ z) 1 approximation, where z is the number of spins interacting with any given spin.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physica A: Statistical Mechanics and its Applications
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
