Fluctuation Induced Diamagnetism in the Zero Magnetic Field Limit in a Low Temperature Superconducting Alloy

Jesús Mosqueira; Carlos Carballeira; Félix Vidal

doi:10.1103/PhysRevLett.87.167009

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Fluctuation Induced Diamagnetism in the Zero Magnetic Field Limit in a Low Temperature Superconducting Alloy

Jesús Mosqueira, Carlos Carballeira, Félix Vidal

DOI 10.1103/PhysRevLett.87.167009 · Physical Review Letters

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Abstract

By using a Pb−18at.%In alloy, the fluctuation induced diamagnetism was measured in the zero magnetic field limit, never observed until now in a low- TC superconductor. This allows us to disentangle the dynamic and the nonlocal electrodynamic effects from the short-wavelength fluctuation effects. The latter may be explained on the grounds of the Gaussian-Ginzburg-Landau approach by introducing a total energy cutoff in the fluctuation spectrum, which strongly suggests the existence of a well-defined temperature in the normal state above which all fluctuating modes vanish. This conclusion may also have implications when describing the superconducting state formation of the high- TC cuprates.