Evaluating the phase diagram of superconductors with asymmetric spin populations

Massimo Mannarelli; Giuseppe Nardulli; Marco Ruggieri

doi:10.1103/PhysRevA.74.033606

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Evaluating the phase diagram of superconductors with asymmetric spin populations

Massimo Mannarelli, Giuseppe Nardulli, Marco Ruggieri

DOI 10.1103/PhysRevA.74.033606 · Physical Review A

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Abstract

The phase diagram of a nonrelativistic fermionic system with imbalanced state populations interacting via a short-range S-wave attractive interaction is analyzed in the mean-field approximation. We determine the energetically favored state for different values of the mismatch between the two Fermi spheres in the weak- and strong-coupling regimes considering both homogeneous and nonhomogeneous superconductive states. We find that the homogeneous superconductive phase persists for values of the population imbalance that increase with increasing coupling strength. In the strong-coupling regime and for large population differences the energetically stable homogeneous phase is characterized by one gapless mode. We also find that the inhomogeneous superconductive phase characterized by the condensate Δ(x)∼Δexp(iq∙x) is energetically favored in a range of values of the chemical-potential mismatch that shrinks to zero in the strong-coupling regime.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown