Pairing Competition in a Quasi-One-Dimensional Model of Organic Superconductors (TMTSF)$_{2}X$ in Magnetic Field
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概要
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We microscopically study the effect of the magnetic field (Zeeman splitting) on the superconducting state in a model for quasi-one-dimensional organic superconductors (TMTSF)$_{2}X$. We investigate the competition between spin singlet and spin triplet pairings and the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state by random phase approximation. While we studied the competition by comparison with the eigenvalue of the gap equation at a fixed temperature in our previous study [Phys. Rev. Lett. 102 (2009) 016403], here we obtain both the $T_{\text{c}}$ for each pairing state and a phase diagram in the $T$ (temperature)–$h_{z}$ (field)–$V_{y}$ (strength of the charge fluctuation) space. The phase diagram shows that consecutive transitions from singlet pairing to the FFLO state and further to $S_{z}=1$ triplet pairing can occur upon increasing the magnetic field when $2k_{\text{F}}$ charge fluctuations coexist with $2k_{\text{F}}$ spin fluctuations. In the FFLO state, the singlet $d$-wave and $S_{z}=0$ triplet $ f$-wave components are strongly mixed especially when the charge fluctuations are strong.
- Physical Society of Japanの論文
- 2009-12-15
著者
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Kuroki Kazuhiko
Department Of Applied Physics And Chemistry The University Of Electro-communications
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Tanaka Yukio
Department Of Applied Physics Nagoya University
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Aizawa Hirohito
Department of Applied Physics and Chemistry, The University of Electro-Communications, Chofu, Tokyo 182-8585
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Tanaka Yukio
Department of Applied Physics, Nagoya University, Nagoya 464-8603
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