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We describe an experiment in superconductivity suitable for an advancedundergraduate laboratory. Point-contact spectroscopy is performed by measuringthe differential conductance between an electrochemically etched gold tip and a100-nm superconducting niobium film with a transition temperature Tc ~= 7 K. Byfitting the results to Blonder-Tinkham-Klapwijk theory using a finite lifetimeof quasiparticles, we obtain a superconducting gap energy \delta ~= 1.53 meV, alower bound to the Fermi velocity vF >= 3.1 x 10^-7 cm/s, and a BCS coherencelength \zeta ~= 43 nm for niobium. These results are in good agreement withprevious measurements.

Undergraduate experiment in point-contact spectroscopy with a Nb/Au junction