Mechanism for the Singlet to Triplet Superconductivity Crossover in Quasi-One-Dimensional Organic Conductors
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概要
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Superconductivity of quasi-one-dimensional organic conductors with a quarter-filled band is investigated using the two-loop renormalization group approach to the extended Hubbard model for which both the single electron hopping $t_{\bot}$ and the repulsive interaction $V_{\bot}$ perpendicular to the chains are included. For a four-patches Fermi surface with deviations to perfect nesting, we calculate the response functions for the dominant fluctuations and possible superconducting states. By increasing $V_{\bot}$, it is shown that a $d$-wave (singlet) to $ f$-wave (triplet) superconducting state crossover occurs, and is followed by a vanishing spin gap. Furthermore, we study the influence of a magnetic field through the Zeeman coupling, from which a triplet superconducting state is found to emerge.
- 2009-10-15
著者
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Tsuchiizu Masahisa
Department Of Physics Nagoya University
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Suzumura Yoshikazu
Department Of Physics Faculty Of Science Tohoku University
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Kajiwara Kazuto
Department of Physics, Nagoya University, Nagoya 464-8602
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Bourbonnais Claude
Départment de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K-2R1, Canada
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Bourbonnais Claude
Départment de Physique, Université de Sherbrooke, Sherbrooke, Québec J1K-2R1, Canada
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