New Resistance Anomaly in Superconducting Bi2Sr2CaCu2O8 Single Crystals

We have measured the resistance of some Bi2Sr2CaCu2O8 superconducting single crystals along ab plane and the c axis. For some of the single crystals, a resistivity anomaly near the superconducting transition temperature is observed in the ab plane. This giant resistance peak is independent of the small driving current (I less than or equal to 40 mA), and the peak is suppressed and vanished gradually with the increasing applied magnetic field (> 100 G). We proposed that the resistance peak is a quasi-reentrant behavior due to the superconducting phase inhomogeneous distribution.