Magnetic phase diagram of Josephson vortices in Bi2Sr2CaCu2O2+y |
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Authors: | K Hirata |
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Institution: | (1) Superconducting Materials Center, National Institute for Materials Science, 1-2-1 Sengen, 305-0047 Tsukuba, Japan |
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Abstract: | We show experimental results on magnetic phases of Josephson vortices (JVs) in Bi2Sr2CaCu2O2+y, obtained from the JV flow-resistance measurements. Periodic oscillations in the flow-resistance enable us to assign the
phase of the long-range 3D ordered state, which was confirmed by the beating effect. We have made preliminary experiments
on the doping effect to the JV magnetic phase. The doping effect is reflected not only in the lower boundary of 3D ordered
phase, but also in the upper boundary. Above the upper boundary, the flow-resistance shows different behaviours, which may
be related to the strength of the interlayer coupling of the JVs along the c-axis, and to the creation/annihilation of pancake
vortex/anti-vortex pairs, thermally and magnetically. |
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Keywords: | Vortex flow-resistance Josephson vortex magnetic phase |
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