(17) A SPIN-OSCILLATOR COUPLED APPROXIMATION FOR THE STATICS AND DYNAMICS OF A FOURTH ORDER ANHARMONIC LATTICE
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We derive the dynamic correlation matrix for a fourth order anharmonic lattice. A selfconsistent Ising spin-oscillator coupled approximation is introduced and shown to yield a static susceptibility in qualitative agreement with the exact result for a non-interacting system. Extensions of the approximation to dynamics, and to a J-dimensional lattice of interacting oscillators are discussed.
物性研究 33(5), E43-E52, 1980-02-20