Vortex phases in magnetic fields near ab-plane in Bi2Sr2CaCu2O8+delta single crystal
Mirkovic, Jovan and Saito, Takashi and Kashiwagi, Takanari and Kakeya, Itsuhiro and Kubo, Yuimaru and Yamamoto, Takashi and Oral, Ahmet and Kadowaki, Kazuo (2010) Vortex phases in magnetic fields near ab-plane in Bi2Sr2CaCu2O8+delta single crystal. In: 9th International Conference on Materials and Mechanisms of Superconductivity, Tokyo, Japan
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Official URL: http://dx.doi.org/10.1016/j.physc.2009.11.095
Vortex matter of the layered superconductors in very high magnetic fields near the ab-plane was studied by using the c-axis resistivity measurements on the mesoscopic Bi2Sr2CaCu2O8+delta single crystals. While the angular dependence of resistance exhibits the sharp lock-in features in low magnetic field region, it was found that the vortex lock-in transition becomes considerably broad in high magnetic fields, showing anomalous shoulders at 0.3 degrees away from the ab-plane. The appearance of the resistance shoulder is followed with the stronger current level dependence, indicating possible different phases due to interplay of Josephson vortices and pancake vortices near ab-plane.
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