Singlet/triplet transition in a two-band organic superconductor

We study quasi-one-dimensional organic superconductors with two-band dispersion. We use spin ladder approximation with the Hubbard model. We determine the symmetry of the Cooper pairing by calculating the free energy. Thanks to close values of singlet and triplet scatterings, the phase diagram revea...

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Bibliographic Details
Published in:Solid state sciences 2008-12, Vol.10 (12), p.1790-1793
Main Authors: Abramovici, G., Belmechri, N., Héritier, M.
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystalline state (including molecular motions in solids)
Exact sciences and technology
Magnetism
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of metals and alloys
Phase transition
Physics
Singlet symmetry
Strongly interacting electrons
Structure of solids and liquids
crystallography
Superconductors
Theory of crystal structure, crystal symmetry
calculations and modeling
Triplet symmetry
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Summary:We study quasi-one-dimensional organic superconductors with two-band dispersion. We use spin ladder approximation with the Hubbard model. We determine the symmetry of the Cooper pairing by calculating the free energy. Thanks to close values of singlet and triplet scatterings, the phase diagram reveals that, at high magnetic field, the triplet configuration is more favorable, indicating a transition from singlet superconducting state at low fields to triplet one. This result confirms similar ones in one-band system and can explain recent experimental results on (TMTSF) 2ClO 4. [Display omitted]
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2008.01.029