Physics – Condensed Matter – Superconductivity
Scientific paper
1999-03-02
Phys. Rev. B 59, R11661 - R11664 (1999).
Physics
Condensed Matter
Superconductivity
4 pages, including 5 eps figures
Scientific paper
10.1103/PhysRevB.59.R11661
The linear ac response of the vortex system is measured locally in Bi-2212 single crystals at various doping, using a miniature two-coil mutual-inductance technique. It was found that a step-like change in the local ac response takes place exactly at the first-order transition (FOT) temperature T_{FOT}(H) determined by a global dc magnetization measurement. The T_{FOT}(H) line in the H-T phase diagram becomes steeper with increasing doping. In the higher-field region where the FOT is not observed, the local ac response still shows a broadened but distinct feature, which can be interpreted to mark the growth of a short-range order in the vortex system.
Ando Yoichi
Nakamura Kazuo
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