Chainani A, Yokoya T, Kiss T, Shin S. Photoemission spectroscopy of the strong-coupling superconducting transitions in lead and niobium.
PHYSICAL REVIEW LETTERS 2000;
85:1966-1969. [PMID:
10970659 DOI:
10.1103/physrevlett.85.1966]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2000] [Indexed: 05/23/2023]
Abstract
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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