Abstract
We analyze the thermodynamics of the Overhauser model and demonstrate rigorously the existence of a phase transition. This is achieved by extending techniques previously developed to treat the BCS model in the quasi-spin formulation. Additionally, we compare the thermodynamics of the quasi-spin and full-trace BCS models. The results are identical up to a temperature rescaling.
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Duffield, N.G., Pulé, J.V. Thermodynamics and phase transitions in the Overhauser model. J Stat Phys 54, 449–475 (1989). https://doi.org/10.1007/BF01023489
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DOI: https://doi.org/10.1007/BF01023489