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 Del...

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Bibliographic Details
Published in:Physical review letters 2000-10, Vol.85 (18), p.3930-3933
Main Authors: Reinert, F, Nicolay, G, Eltner, B, Ehm, D, Schmidt, S, Hufner, S, Probst, U, Bucher, E
Format: Article
Language:English
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Summary: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).
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.85.3930