Important Role of Josephson-Vortex Pinning in the Mixed State Properties in Oxygen-Content Controlled YBCO Single Crystals(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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In-plane anisotropy of the resistivity and phase transition of the Josephson-vortex system have been studied in YBCO crystals with different oxygen-contents. Angular dependences of the resistivity are represented by superposition of four-fold anisotropy with a sharps dip for H‖a- and b-axes and two-fold one in under-doped and over-doped crystals. Only two-fold in-plane anisotropy appears in optimally-doped ones. The anisotropic behaviors are described by the superconducting fluctuation and the Josephson-vortex pinning effect. The resistive transition for H‖a- and b-axes shows sharp drop to zero resistivity accompanied with the first-order phase transition in the optimally-doped crystals. It is characterized by the second-order vortex-glass transition in over-doped and under-doped ones. It is indicated that the Josephson-vortex pinning is important in the determination of the in-plane anisotropy of the resistivity and the phase transition.
- 社団法人日本物理学会の論文
- 2005-12-15
著者
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Naito T
School Of Materials Science Jaist
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Naito Tomoyuki
School Of Health And Sport Sciences Osaka University
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IWASAKI Hideo
School of Materials Science, JAIST
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HARAGUCHI Seiya
School of Materials Science, JAIST
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Haraguchi Seiya
School Of Materials Science Jaist
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Nojima T
Institute For Materials Research Tohoku University
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Iwasaki Hideo
School Of Materials Science Jaist
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NAITO Tomoyuki
School of Materials Science, JAIST
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