Magnetic-Field Variations of the Pair-Breaking Effects of Superconductivity in (TMTSF)_2ClO_4(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
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概要
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We have studied the onset temperature of the superconductivity T^<onset>_c of the organic superconductor (TMTSF)_2ClO_4, by precisely controlling the direction of the magnetic field H. We compare the results of two samples with nearly the same onset temperature but with different scattering relaxation time τ. We revealed a complicated interplay of a variety of pair-breaking effects and mechanisms that overcome these pair-breaking effects. In low fields, the linear temperature dependences of the onset curves in the H-T phase diagrams are governed by the orbital pair-breaking effect. The dips in the in-plane field-angle φ dependence of T^<onset>_c, which were only observed in the long-τ sample, provides definitive evidence that the field-induced dimensional crossover enhances the superconductivity if the field direction is more than about 19° away from the a axis. In the high-field regime for H ‖ a, the upturn of the onset curve for the long-τ sample indicates a new superconducting state that overcomes the Pauli pair-breaking effect but is easily suppressed by impurity scatterings. The Pauli effect is also overcome for H ‖ b' by a realization of another state for which the maximum of T^<onset>_c (φ) occurs in a direction different from the crystalline axes. The effect on T^<onset>_c of tilting the applied field out of the conductive plane suggests that the Pauli effect plays a significant role in determining T^<onset>_c. The most plausible explanation of these results is that (TMTSF)_2ClO_4 is a singlet superconductor and exhibits Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in high fields.
- 社団法人日本物理学会の論文
- 2008-05-15
著者
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YONEZAWA Shingo
Department of Neurosurgery, Aomori Prefectural Central Hospital
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MAENO Yoshiteru
Department of Physics, Graduate School of Science, Kyoto University
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Maeno Yoshiteru
Department Of Physics Graduate School Of Science Kyoto University
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Yonezawa Shingo
Department Of Physics Graduate School Of Science Kyoto University
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Yonezawa Shingo
Department Of Neurosurgery Aomori Prefectural Central Hospital
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Jerome Denis
Laboratoire De Physique Des Solides (umr 8502)-universite Paris-sud
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Jerome Denis
Laboratoire De Physique Des Solides
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KUSABA Shuichi
Department of Physics, Graduate School of Science, Kyoto University
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AUBAN-SENZIER Pascale
Laboratoire de Physique des Solides (UMR 8502)-Universite Paris-Sud
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PASQUIER Claude
Laboratoire de Physique des Solides (UMR 8502)-Universite Paris-Sud
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Maeno Yoshiteru
Department Of Physics Faculty Of Science Hiroshima University
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Kusaba Shuichi
Department Of Physics Graduate School Of Science Kyoto University
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Yonezawa Shingo
Department of Physics, Graduate School of Science, Kyoto University
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