Short-Range Order Effects and the Central Peak in the Tunneling Model

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概要

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• The tunneling model is studied on the basis of the perturbation expansion using pseudo-fermion operators for spins. Effects of short-range order on its dynamical properties are investigate in the case where the perturbation expansion becomes "1/z expansion". The effects on a pseudo-spin are taken into account in a kind of a mean field approximation for fluctuation field of the order parameter. It is shown that the relaxational mode appears in the corresponding Green's function on account of effects of short-range order and is linearly coupled to the soft mode. This relaxation mode can be regarded as a longitudinal one along average directions of local spins which is realized when pseudo-spins align locally in space and time due to the short-range order. The damping of the relaxatioal mode is shown to be of the order of that of the soft mode and to be very small for typical cases. This leads to a sharp central peak in the dynamical form factor.

• 理論物理学刊行会の論文
• 1976-04-25

著者

• Takada S

  Univ. Tsukuba Ibaraki

• Kurosawa Hideo

  Faculty Of Technology Kanagawa University

• Takada Satoshi

  Department Of Pysics Tokyo University Of Education

• Takada Satoshi

  Department Of Applied Biology Faculty Of Textile Science And Technology Shinshu University

• Ohmura Yoshihiro

  Department Of Physics Faculty Of Science Tokyo Institute Of Technology

• Ohmura Yoshihiro

  Department Of Pysics Tokyo Institute Of Technology

• OHNARI Itsuo

  Faculty of Technology, Kanagawa University

• Ohnari Itsuo

  Faculty Of Technology Kanagawa University

• TAKADA Satoshi

  Department of Physics, Tokyo University of Education, Tokyo

• OHMURA Yoshihiro

  Department of Pysics, Tokyo Institute of Technology

• OHNARI Itsuo

  Institute of Physics, Kanagawa University

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