Evidence for a Temperature-Dependent Surface Shielding Effect in Cu
J. M. LockhartDepartment of Physics, Stanford University, Stanford, California 94305F. C. WittebornDepartment of Physics, Stanford University, Stanford, California 94305W. M. FairbankDepartment of Physics, Stanford University, Stanford, California 94305
1977en
ABI
Abstract
A large temperature-dependent transition in the magnitude of the ambient axial electric field inside a vertical copper tube has been observed. Above a temperature of 4.5 K the ambient field is 3 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}7}$ V/m or greater. Below 4.5 K, the magnitude of the ambient field drops very rapidly, reaching about -5 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}11}$ V/m at 4.2 K. We believe that these effects results from the presence of a surface electron layer on the inside wall of the tube which provides a temperature-dependent shielding effect.
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Cited by 20 references