Vortex phase transformations probed by the local ac response of Bi2Sr2CaCu2O8+δ single crystals with various doping
Yoichi Ando, K. Nakamura
Abstract
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 TFOT(H) determined by a global dc magnetization measurement. The TFOT(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.
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