Fractional Quantized Vortices as Direct Evidence of d_<x^2-y^2> -Wave Pairing Symmetry up to Critical Temperature in High-T_c Cuprate Superconductors
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概要
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The detection of the fractional vortices at asymmetric bicrystal boundaries in Bi_2Sr_2CaCu_2O_<8+y> (BSCCO) and YBa_2Cu_3O_<7-y> (YBCO) thin films using a scanning superconducting quantum interference device (SQUID) microscope (SSM) is reported. The measurements are performed from 3K to 90K and the unconventional fractional vortices are found to exist up to the local critical temperature T_<J_c> at the Josephson boundary. The results provide the evidence of d_x2_<-y>2 symmetry of superconducting order parameter up to T_<J_c>, and the observed fractional vortices under different bicrystal geometries are explained by the Sigrist-Rice Josephson current formula based on the d_x2_<-y>2-wave pairing symmetry.
- 社団法人応用物理学会の論文
- 2002-07-01
著者
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Iguchi Ienari
Department Of Applied Physics Tokyo Institute Of Technology
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Kashiwaya Satoshi
Department Of Physics And Crest-jst Tokyo Institute Of Technology
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Sugimoto Akira
Department Of Cardiology Saiseikai Ibaraki Hospital
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Miyake Takashi
Department Of Biology Faculty Of Science Kyushu University
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Iguchi Ienari
Department of Physics and CREST-JST, Tokyo Institute of Technology
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TAKEDA Tomohiro
Department of Physics and CREST-JST, Tokyo Institute of Technology
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Sugimoto Akira
Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture
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