An attempt has been made to measure the rate of change of superconducting transition temperature Tc, as a function of surface charge density σ, in tin films. For films having thicknesses of 190, 670, and 1460 Å, |dTc/dσ| was found in all cases to be less than 30 deg cm2 C−1, the limit of sensitivity of the present apparatus. This negative result is compared with Glover and Sherrill's finding that in a tin film 70 Å thick, dTc/dσ = −460 deg cm2 C−1.
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Bonfiglioli et al. (1962) studied this question.
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