Physical Review A, volume 165, issue 2, pages 588-595
Far-infrared absorption in thin superconducting lead films
Publication type: Journal Article
Publication date: 1968-01-10
Journal:
Physical Review A
Quartile SCImago
Q1
Quartile WOS
Q2
Impact factor: 2.9
ISSN: 24699926, 24699934, 0031899X, 10502947, 10941622
General Physics and Astronomy
Abstract
We describe measurements of the far-infrared conductivity ${\ensuremath{\sigma}}_{1}\ensuremath{-}i{\ensuremath{\sigma}}_{2}$ of thin superconducting lead films with resistances of about $\frac{200\ensuremath{\Omega}}{\mathrm{square}}$ in the normal state. The conductivity is inferred from measurements of the transmittance and reflectance of a thin film of lead which has been evaporatively deposited on a quartz crystal. We report results for the real part of the conductivity of lead over the frequency range 9 to 120 ${\mathrm{cm}}^{\ensuremath{-}1}$. From these we infer an energy gap for lead films at $T=0$ of 22.5\ifmmode\pm\else\textpm\fi{}0.5 ${\mathrm{cm}}^{\ensuremath{-}1}$, or $(4.5\ifmmode\pm\else\textpm\fi{}0.1)k{T}_{c}$, where $k$ is the Boltzmann constant and ${T}_{c}$ is the superconducting transition temperature. The measurements were made at 2.0, 4.3, and 5.5\ifmmode^\circ\else\textdegree\fi{}K, and the energy gap varies with temperature in the manner predicted by the Bardeen-Cooper-Schrieffer theory. The frequency dependence of the real part of the conductivity also is in good agreement with the theory. No evidence is found of the strong precursor absorption which had been previously reported in the energy gap in lead, but ${\ensuremath{\sigma}}_{2}$ is found to be anomalously low (by \ensuremath{\sim}25%) near and below the gap frequency. This is believed to result from the strong-coupling anomalies discussed by Nam. This anomalously low ${\ensuremath{\sigma}}_{2}$ would also account for the anomalously steep absorption edge observed in other experiments on lead.
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Citations by publishers
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American Physical Society (APS)
53 publications, 38.69%
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Springer Nature
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IEEE
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Optical Society of America
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1 publication, 0.73%
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Hindawi Limited
1 publication, 0.73%
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Taylor & Francis
1 publication, 0.73%
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American Chemical Society (ACS)
1 publication, 0.73%
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Treatise
1 publication, 0.73%
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- We do not take into account publications without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Palmer L. H., Tinkham M. Far-infrared absorption in thin superconducting lead films // Physical Review A. 1968. Vol. 165. No. 2. pp. 588-595.
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Palmer L. H., Tinkham M. Far-infrared absorption in thin superconducting lead films // Physical Review A. 1968. Vol. 165. No. 2. pp. 588-595.
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TY - JOUR
DO - 10.1103/PhysRev.165.588
UR - https://doi.org/10.1103/PhysRev.165.588
TI - Far-infrared absorption in thin superconducting lead films
T2 - Physical Review A
AU - Palmer, Leigh Hunt
AU - Tinkham, M.
PY - 1968
DA - 1968/01/10 00:00:00
PB - American Physical Society (APS)
SP - 588-595
IS - 2
VL - 165
SN - 2469-9926
SN - 2469-9934
SN - 0031-899X
SN - 1050-2947
SN - 1094-1622
ER -
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@article{1968_Palmer,
author = {Leigh Hunt Palmer and M. Tinkham},
title = {Far-infrared absorption in thin superconducting lead films},
journal = {Physical Review A},
year = {1968},
volume = {165},
publisher = {American Physical Society (APS)},
month = {jan},
url = {https://doi.org/10.1103/PhysRev.165.588},
number = {2},
pages = {588--595},
doi = {10.1103/PhysRev.165.588}
}
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MLA
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Palmer, Leigh Hunt, et al. “Far-infrared absorption in thin superconducting lead films.” Physical Review A, vol. 165, no. 2, Jan. 1968, pp. 588-595. https://doi.org/10.1103/PhysRev.165.588.