Breakdown by a magnetic field of the superconducting fluctuations in the normal state in Pb_{1-x}In_x alloys

Details Breakdown by a magnetic field of the superconducting fluctuations in the normal state in Pb_{1-x}In_x alloys Breakdown by a magnetic field of the superconducting fluctuations in the normal state in Pb_{1-x}In_x alloys

2003-12-26

arxiv.org/abs/cond-mat/0312647v1

Physics

Condensed Matter

Superconductivity

LaTeX, 13 pages including 4 figures

Scientific paper

The effects induced on the magnetization by coherent fluctuating Cooper pairs in the normal state have been measured in Pb_{1-x}In_x alloys up to high magnetic fields, of amplitudes above Hc2(0), the upper critical field extrapolated to T=0K. Our results show that in dirty alloys these superconducting fluctuation effects are, in the entire H-T phase diagram above Hc2(T), independent of the amount of impurities and that they vanish when H~1.1Hc2(0). These striking results are consistent with a phenomenological estimate that takes into account the limits imposed by the uncertainty principle to the shrinkage, when H increases, of the superconducting wave function.

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