Anisotropy in the resistive superconducting transition under magnetic fields in single crystal Pb2Sr2Ho0.5Ca0.5Cu3O8 |
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| Authors: | Takashi Noji Yoji Koike Hideo Iwasaki Masatsune Kato Norio Kobayashi Yoshitami Saito |
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| Affiliation: | (1) Department of Applied Physics, Faculty of Engineering, Tohoku University, Aramaki Aoba, Aoba-ku, 980-77 Sendai, Japan;(2) Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, 980-77 Sendai, Japan;(3) Present address: School of Materials Science, Japan Advanced Institute of Science and Technology, Hokuriku, 15 Asahidai, Tatsunokuchi-machi, Nomi-gun, 923-12 Ishikawa, Japan |
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| Abstract: | Anisotropie properties of the single crystal Pb2Sr2Ho0.5Ca0.5Cu3O8 have been investigated by measuring the electrical resistivity in theab-plane ab(H,  ,T), which depends on the angle between theab-plane and the magnetic-field direction, in various constant fieldsH perpendicular to the current direction. All the angle-dependent values ofab(H, ,T) at a constant temperature are scaled to be on one curve as a function of reduced field. The anisotropic parameter   (mc*/mab*)1/2 is estimated as 12–13, which is larger than that of YBa2Cu3O7 and much smaller than that of Bi2Sr2CaCu2O8. It has been concluded that the anisotropy does not always depend on the thickness of the blocking layer but seems to depend on the overlap of the electronic wave functions along thec-axis. Anisotropy in the pinning potential has also been discussed from the resistive tail in the temperature dependence ofab(H,,T). |
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| Keywords: | High-Tc superconductivity Pb2Sr2Ho0.5Ca0.5Cu3O8 single crystal upper critical magnetic field anisotropy |
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