2 papers
cond-mat.str-el1998
Elementary excitations of magnetically ordered systems with orbital degeneracy
A. Joshi, M. Ma, F. Mila +2
The Holstein-Primakoff transformation is generalized to develop a quantum flavor wave theory for spin systems with orbital degeneracy. Elementary excitations consist of spin, orbit…
cond-mat1995
Phase Transitions of the Bilayered Spin-S Heisenberg Model and Its Extension to Fractional Dimensions
Kwai-Kong Ng, Fu Chun Zhang, Michael Ma
We study the ground state and the phase transitions of the bilayered spin- antiferromagnetic Heisenberg model using the Schwinger boson mean field theory. The interplane couplin…