Bound States in Normal-Metal—Superconductor Sandwiches: Magnetic Field Dependence and Estimate of Fermi Velocities in Zinc

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Abstract
The pair potential well, produced in a normal metal by proximity with a superconductor, supports bound states which can be observed in a tunneling experiment. Such states have been observed in Pb/Zn-zinc oxide-Pb, and the temperature dependence of the I–V characteristic has been reported. Here these experiments are continued, showing, in particular, the magnetic field dependence of the bound states. The dressed Fermi velocities along the c axis of zinc are estimated to range from 0.4×108 to 1.0×108 cm/sec, but to obtain improved accuracy in this measurement cleaner and thicker Zn films are required.

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