Low temperature vortex phase diagram of Bi2Sr2CaCu2O8 : a magnetic penetration depth study
R. Prozorov, R. W. Giannetta, T. Tamegai, P. Guptasarma, D. G. Hinks
Abstract
We report measurements of the magnetic penetration depth λm(T) in the presence of a DC magnetic field in optimally doped BSCCO-2212 single crystals. Warming, after magnetic field is applied to a zero-field cooled sample, results in a non-monotonic λm(T), which does not coincide with a curve obtained upon field cooling, thus exhibiting a hysteretic behaviour. We discuss the possible relation of our results to the vortex decoupling, unbinding, and dimensional crossover.
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