title: Observation of a BCS spectral function in a conventional superconductor by photoelectron spectroscopy
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).
authors.affiliation: Universitat des Saarlandes, Fachrichtung 7.2-Experimentalphysik, D-66041 Saarbrucken, Germany.
authors.initials: F
authors.lastname: Reinert
authors.initials: G
authors.lastname: Nicolay
authors.initials: B
authors.lastname: Eltner
authors.initials: D
authors.lastname: Ehm
authors.initials: S
authors.lastname: Schmidt
authors.initials: S
authors.lastname: Hufner
authors.initials: U
authors.lastname: Probst
authors.initials: E
authors.lastname: Bucher