Gap symmetry and intrinsic intraplane pinning of untwinned YBa2Cu3O7 single crystals |
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Authors: | Takekazu Ishida Kiichi Okuda Hidehito Asaoka Yukio Kazumata Kenji Noda Humihiko Takei |
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Affiliation: | (1) Department of Physics and Electronics, Osaka Prefecture University, 1-1, Gakuen-cho, Sakai, 593 Osaka, Japan;(2) JAERI, Tokai-mura, Naka-gun, 319-11 Ibaraki, Japan;(3) Faculty of Science, Osaka University, Toyonaka, 560 Osaka, Japan |
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Abstract: | The interplane (cb) and intraplane (ab) anisotropy of untwinned YBa2 Cu307 single crystals has been investigated by means of the torque magnetometry. To extract the reversible and irreversible components, the torque was measured as a function of increasing angle as well as decreasing angle. The interplane irreversible torque irr shows two-fold peaks at c =90 ° and270 ° (of half width11 ° at77 K) due to the well-known intrinsic interplane pinning. A novel intrinsic pinning has been discovered in the intraplane irreversible torque, i.e., irr shows four-fold peaks of half width20° at77 K when a =0 °, 90 °, 180 ° and270 °. We argue that the intrinsic intraplane pinning comes from the four-fold nature of the gap parameter. |
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