Enhancement of Irreversibility Field in Carbon-substituted MgB_2 Single Crystals(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report on a detailed study of the irreversibility field H_<irr> of single crystals of Mg(B_<1-x>C_x)_2 (x = 0, 2, 3.5, 5 and 7.5%) in strong magnetic fields of up to 40T. Highly sensitive torque measurements revealed that H_<irr> is greatly enhanced by a factor of two (μ_0H_<irr>(0) 〓 33 T with x = 5%) by carbon substitution compared with that of the pristine MgB_2, owing to a reduction in in-plane coherence length. We also observed the temperature-dependent H_<irr> anisotropy for all carbon contents. This strongly suggests that the two-gap superconductivity of MgB_2 is less influenced by a small amount of carbon substitution. We discuss these results by focusing on the impact of carrier doping and impurity scattering on a two-gap superconductor.
- 社団法人日本物理学会の論文
- 2004-08-15
著者
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TAJIMA Setsuko
Department of Physics, Graduate School of Science, Osaka University
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Lee Sergey
Superconductivity Research Laboratory Istec
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MASUI Takahiko
Department of Physics, Graduate School of Science, Osaka University
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OHMICHI Eiji
Institute for Solid State Physics, University of Tokyo
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MASUI Takahiko
Superconductivity Research Laboratory, ISTEC
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TAJIMA Setsuko
Superconductivity Research Laboratory, ISTEC
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OSADA Toshihito
Institute for Solid State Physics, University of Tokyo
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Tajima Setsuko
Department Of Physics Graduate School Of Science Osaka University
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Tajima Setsuko
Superconductivity Research Laboratory International Superconductivity Technology Center
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Tajima S
Department Of Physics Graduate School Of Science Osaka University
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Osada Toshihito
Department Of Pure And Applied Sciences University Of Tokyo
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Osada Toshihito
Institute For Solid State Physics University Of Tokyo
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Osada Toshihito
Department Of Pure And Applied Science University Of Tokyo
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Ohmichi Eiji
Institute For Solid State Physics University Of Tokyo
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Masui Takahiko
Department Of Physics Graduate School Of Science Osaka University
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Osada T
Institute For Solid State Physics University Of Tokyo
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Ohmichi E
Institute For Solid State Physics University Of Tokyo
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