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