Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 9, Pages 1966-1969Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.1966
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We study the changes in the electronic structure associated with low-T-C 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-T-C cuprates is seen in Pb, making it a characteristic of strong-coupling superconductivity.
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