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Vortex Lens in Bi2Sr2CaCu2O8+y
Tsuyoshi Tamegai,Hiroyuki Chiku,Masashi Tokunaga 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
The control of pancake vortices (PVs) caused by Josephson vortices (JVs) is demonstrated in the highly anisotropic superconductor Bi2Sr2CaCu2O8+y. The moderately strong attractive interactions between PVs and JVs in the crossing-lattices state under tilted fields are utilized to change the distribution of PVs. Micro-Hall probe magnetometry and differential magneto-optical imaging provide direct evidence for such a novel control. We have succeeded in visualizing the lensing effect of PVs by slowly ramping the in-plane field in the presence of a small c-axis field. How the lensing effect is affected by the history, the density of PVs, and the temperature is systematically studied.