The pairons move with linear dispersion relations. The 2D system of the pairons undergoes a Bose–Einstein condensation at the critical temperature \(T_{c}\), \(k_{B}T_{c}=1.24\,\hbar v_{F}n^{1/2}\), where \(n\) is the pairon density and \(v_{F}\) the Fermi speed. The superconducting transition is a phase change of second order.
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Fujita, S., Ito, K., Godoy, S. (2009). Quantum Statistical Theory. In: Quantum Theory of Conducting Matter. Springer, New York, NY. https://doi.org/10.1007/978-0-387-88211-6_6
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