The superconducting phase diagram in a model for tetragonal and cubic\n systems with strong antiferromagnetic correlations

2004/01/30 by J. J. Deisz, Deisz, J. J.
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0401644

4 pages, submitted to Physical Review 21 November 2003

arxiv created 2004/01/30 · openalex publication_date 2004/01/30 · arxiv updated 2009/12/01 · openalex created_date 2020/03/27 · openalex updated_date 2026/07/28

Abstract

We calculate the superconducting phase diagram as a function of temperature\nand z-axis anisotropy in a model for tetragonal and cubic systems having strong\nantiferromagnetic fluctuations. The formal basis for our calculations is the\nfluctuation exchange approximation (FLEX) applied to the single-band Hubbard\nmodel near half-filling. For nearly cubic lattices, two superconducting phase\ntransitions are observed as a function of temperature with the low-temperature\nstate having the time-reversal symmetry-breaking form, d_{x² - y²} \±\nid_{3z² -r²}. With increasing tetragonal distortion the\ntime-reversal-symmetry-breaking phase is suppressed giving way to only d_{x²\n- y²} or d_{3z² -r²} single-component phases. Based on these results, we\npropose that CeIn₃ is a candidate for exhibiting a time-reversal\nsymmetry-breaking superconducting state.\n

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