Faculty Publications

Title

Superconducting phase diagram in a model for tetragonal and cubic systems with strong antiferromagnetic correlations

Document Type

Article

Journal/Book/Conference Title

Physical Review B - Condensed Matter and Materials Physics

Volume

75

Issue

6

Abstract

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.

Original Publication Date

2-15-2007

DOI of published version

10.1103/PhysRevB.75.064507

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