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THE SPIN WAVE THEORY OF A HEISENBERG FERROMAGNETIC SYSTEM WITH BIQUADRATIC EXCHANGE INTERACTION AT LOW TEMPERATURES

TAO RUI-BAO PU FU-CHO

THE SPIN WAVE THEORY OF A HEISENBERG FERROMAGNETIC SYSTEM WITH BIQUADRATIC EXCHANGE INTERACTION AT LOW TEMPERATURES

TAO RUI-BAO, PU FU-CHO
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  • Received Date:  12 May 1979
  • Published Online:  29 July 2005

THE SPIN WAVE THEORY OF A HEISENBERG FERROMAGNETIC SYSTEM WITH BIQUADRATIC EXCHANGE INTERACTION AT LOW TEMPERATURES

  • 1. (1)复旦大学物理系; (2)中国科学院物理研究所

Abstract: We presented here a theory of the Heisenberg ferromagnetic system with biquadratic exchange interaction at, low temperatures. In our theory, the kinematic and dynamic interactions are correctly included. The expansion for Sz in terms of temperature and the temperature dependence of spin wave spectrum are obtained ri-grously.

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