Observation of a BCS spectral function in a conventional superconductor by photoelectron spectroscopy

F Reinert; G Nicolay; B Eltner; D Ehm; S Schmidt; S Hufner; U Probst; E Bucher

doi:10.1103/PhysRevLett.85.3930

Observation of a BCS spectral function in a conventional superconductor by photoelectron spectroscopy

Phys Rev Lett. 2000 Oct 30;85(18):3930-3. doi: 10.1103/PhysRevLett.85.3930.

Authors

F Reinert¹, G Nicolay, B Eltner, D Ehm, S Schmidt, S Hufner, U Probst, E Bucher

Affiliation

¹ Universitat des Saarlandes, Fachrichtung 7.2-Experimentalphysik, D-66041 Saarbrucken, Germany.

PMID: 11041963
DOI: 10.1103/PhysRevLett.85.3930

Abstract

We present high-resolution photoelectron spectra on the A15-type conventional superconductor V 3Si, where-for the first time-both singularities of the BCS density of states can be resolved by photoemission spectroscopy (PES). With a transition temperature of about T(c) approximately 17 K the gap Delta(gap) of this compound has a magnitude of approximately 5 meV. A measurement by PES on this small energy scale requires a very high energy resolution (DeltaE less, similar5 meV) and sample temperatures significantly below T(c).