Specific Heat of a Quantum Spin Chain of an Easy-Plane Type under an In-Plane Magnetic Field : Ferromagnetic Chain with S=1
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Quantum statistical mechanics is developed for an easy-plane ferromagnetic chain under an in-plane magnetic field. A pair product approximation is made for the density matrix. A transfer integral expression for the partition function is formulated by the use of the coherent state of spin. Specific heat is computed as a function of temperature and magnetic field for the case of strong single-ion anisotropy. From our qualitative study it is suggested that, beyond the sine-Gordon approximation, simultaneous consideration of the quantum effect and the instability against the off-plane fluctuation (the Kumar-Magyari-Thomas instability) is necessary to explain specific heat, in particular, and thermodynamic quantities, in general, of the present system.
- 理論物理学刊行会の論文
- 1985-03-31
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