Superconducting phase diagram in a model for tetragonal and cubic systems with strong antiferromagnetic correlations
Physical Review B - Condensed Matter and Materials Physics
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 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 d x2 - y2 ±i d3 z2 - r2. With increasing tetragonal distortion, the time-reversal symmetry-breaking phase is suppressed, giving way to only d x2 - y2 or d3 z2 - r2 single-component phases. Based on these results, we propose that a time-reversal symmetry-breaking superconducting state may be found in cubic systems with pairing driven by antiferromagnetic fluctuations. © 2007 The American Physical Society.
Department of Physics
Original Publication Date
DOI of published version
Deisz, J. J., "Superconducting phase diagram in a model for tetragonal and cubic systems with strong antiferromagnetic correlations" (2007). Faculty Publications. 2648.