Evidence for vortex lattice melting and softening in untwinned YBa2Cu3O7 single crystal |
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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: | Real part of the ac susceptibility X 1 of an untwinned YBa2 Cu3O7 single crystal jumps at the onset temperature in the narrow width (0.1 K in 0.7 T), suggesting the first-order melting transition. A sharp X1 dip and a sharp X peak can be interpreted as synchronous trapping of vortices due to lattice softening prior to melting. At lower temperatures, the X1-X1 chart shows a single-parameter behavior while the melting occurs as a strong deviation from this. |
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