Experimental observation of the breakdown by a magnetic field of the superconducting fluctuations in the normal state

Félix Soto; Carlos Carballeira; Jesús Mosqueira; Manuel V. Ramallo; Mauricio Ruibal; José A. Veira; Félix Vidal

doi:10.1103/PhysRevB.70.060501

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Experimental observation of the breakdown by a magnetic field of the superconducting fluctuations in the normal state

Félix Soto, Carlos Carballeira, Jesús Mosqueira, Manuel V. Ramallo, Mauricio Ruibal, José A. Veira, Félix Vidal

DOI 10.1103/PhysRevB.70.060501 · Physical Review B

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Abstract

The effects induced on the normal state magnetization by fluctuating Cooper pairs have been measured in Pb1−xInx alloys up to magnetic fields 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 seem to be consistent with the limits imposed by the uncertainty principle to the shrinkage of the superconducting wave function.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb1-xInx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown