Determination of the Energy Gap in Nb sub 0 sub 75 Zr sub 0 sub 25 Using a Proximity Tunneling Method

摘要

A well defined structure in the tunneling density of states N/sub T/(E) for junctions of the form In/Al sub 2 O sub 3 /AlNb sub 0 . sub 75 Zr sub 0 . sub 25 was observed. Observation determined 2 delta /kT/sub C/ = 4.1 at T/sub C/ = 10.7 K in Nb sub 0 . sub 75 Zr sub 0 . sub 25 . The method may be applicable to other superconductors which do not form a suitable thermal oxide tunnel barrier. (ERA citation 04:006236)