Photoemission Spectroscopy of the Strong-Coupling Superconducting Transitions in Lead and Niobium

A. Chainani; T. Yokoya; T. Kiss; S. Shin

doi:10.1103/PhysRevLett.85.1966

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Photoemission Spectroscopy of the Strong-Coupling Superconducting Transitions in Lead and Niobium

A. Chainani, T. Yokoya, T. Kiss, S. Shin

DOI 10.1103/PhysRevLett.85.1966 · Physical Review Letters

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Abstract

We study the changes in the electronic structure associated with low- Tc strong-coupling superconducting transitions in Pb and Nb using ultrahigh-resolution (2.3 meV) temperature-dependent (5.3–12.0 K) photoemission spectroscopy. We observe peaks in the density of states on entering the superconducting-phase accompanying gap formation and spectacular redistribution of spectral weight at low energy scales as a function of temperature. The well-known peak-dip feature of the high- Tc cuprates is seen in Pb, making it a characteristic of strong-coupling superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.19	Pressure not reported	unknown
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.26	Pressure not reported	unknown