Observation of a BCS Spectral Function in a Conventional Superconductor by Photoelectron Spectroscopy

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

doi:10.1103/PhysRevLett.85.3930

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Observation of a BCS Spectral Function in a Conventional Superconductor by Photoelectron Spectroscopy

F. Reinert, G. Nicolay, B. Eltner, D. Ehm, S. Schmidt, S. Hüfner, U. Probst, E. Bucher

DOI 10.1103/PhysRevLett.85.3930 · Physical Review Letters

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Abstract

We present high-resolution photoelectron spectra on the A15-type conventional superconductor V3Si, 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 Tc≈17K the gap Δgap 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 (ΔE≲5meV) and sample temperatures significantly below Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
V3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17.1	Pressure not reported	unknown
Nb3Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	18.6	Pressure not reported	unknown