2.5. Ising model in a purely imaginary magnetic field Consider the one-dimensional Ising model with next-neighbour interaction
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2.5. Ising model in a purely imaginary magnetic field Consider the one-dimensional Ising model with next-neighbour interaction in the presence of a purely imaginary magnetic field B = ih. Study the correlation length of the model, expressed by eqn. (2.2.28) and show that there exist an infinite number of pairs (J , h) for which it diverges.
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Related Book For 
Statistical Field Theory An Introduction To Exactly Solved Models In Statistical Physics
ISBN: 9780198788102
2nd Edition
Authors: Giuseppe Mussardo
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