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Zeeman effect in superconducting two-leg ladders: irrational magnetization plateaus and exceeding the Pauli limit | | G. Roux
; S. R. White
; S. Capponi
; D. Poilblanc
; | | Date: |
1 Dec 2005 | | Subject: | Strongly Correlated Electrons; Superconductivity | | Abstract: | The effect of a parallel magnetic field on superconducting two-leg ladders is investigated numerically. The magnetization curve displays an irrational plateau at a magnetization equal to the hole density. Remarkably, its stability is fundamentally connected to the existence of a well-known magnetic resonant mode. Once the zero-field spin gap is suppressed by the field, pairs acquire a finite momentum characteristic of a Fulde-Ferrell-Larkin-Ovchinnikov phase. In addition, S^z=0 triplet superconducting correlations coexist with singlet ones above the irrational plateau. This provides a simple mechanism in which the Pauli limit is exceeded as suggested by recent experiments. | | Source: | arXiv, cond-mat/0512025 | | Other source: | [GID 812911] pmid17026332 | | Services: | Forum | Review | PDF | Favorites | |
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