TITLE:
Direct Experimental Evidence of the Statistical Nature of the Electron Gas in Superconducting Films
AUTHORS:
Mario Iannuzzi, Massimiliano Lucci, Ivano Ottaviani
KEYWORDS:
Superconductivity, Bose-Condensation
JOURNAL NAME:
Journal of Modern Physics,
Vol.5 No.16,
October
30,
2014
ABSTRACT: In an Nb
film an alternate electrical current is partitioned at a Y-shaped obstacle into two splitted beams. The
intensity-fluctuation correlation of the two beams (cross-correlation) and the
intensity-fluctuation correlation of one beam (auto-correlation) are measured
within a low-frequency bandwidth as a function of the incident beam intensity,
at temperatures T above or below the
temperature Tc of the
superconductive transition. The results of these measurements reveal the
statistical nature of the electron gas in the normal film and in the
superconducting film. The conceptual scheme of the present experiment is a
version of the Hanbury Brown and Twiss (HBT) experiment, here adopted for a gas
of particles in a solid.