1/n Expansion for Weakly Random System
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This paper is concerned with 1/n expansion for a random spin system. The interaction between the i-th and the j-th site is assumed to be K^^^_<ij>=K_<ij>(1-ap_i)(1-ap_j) where p_i is a random variable. By assuming that a is small (weakly random case), the partition function in the presence of magnetic field is expanded in a double series of 1/n and a for the quenched case. The equation of state is derived up to a^2 in the limit n→∞. It is shown that critical exponents take their spherical model values up to this order.
- 理論物理学刊行会の論文
- 1978-03-25
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