The superconducting phase diagram in a model for tetragonal and cubic systems with strong antiferromagnetic correlations
Deisz, J. J.
Original · EN
We calculate the superconducting phase diagram as a function of temperature and z-axis anisotropy in a model for tetragonal and cubic systems having strong antiferromagnetic fluctuations. The formal basis for our calculations is the fluctuation exchange approximation (FLEX) applied to the single-band Hubbard model near half-filling. For nearly cubic lattices, two superconducting phase transitions are observed as a function of temperature with the low-temperature state having the time-reversal symmetry-breaking form, dₓ₂ ₋ y₂ ± id₃z₂ ₋ᵣ₂. With increasing tetragonal distortion the time-reversal-symmetry-breaking phase is suppressed giving way to only dₓ₂ ₋ y₂ or d₃z₂ ₋ᵣ₂ single-component phases. Based on these results, we propose that CeIn₃ is a candidate for exhibiting a time-reversal symmetry-breaking superconducting state.
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