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

Felix Soto·Carlos Carballeira·Jesus Mosqueira·Manuel V. Ramallo·Mauricio Ruibal·Jose A. Veira·Felix Vidal
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Abstract

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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Felix Soto, Carlos Carballeira, Jesus Mosqueira, Manuel V. Ramallo, Mauricio Ruibal, Jose A. Veira, Felix Vidal. 2003-12-26. Breakdown by a magnetic field of the superconducting fluctuations in the normal state in Pb_{1-x}In_x alloys. https://arxiv.org/abs/cond-mat/0312647

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