Physical Review A, volume 165, issue 2, pages 588-595

Far-infrared absorption in thin superconducting lead films

Leigh Hunt Palmer ¹

M. Tinkham ^{1, 2}

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Department of Physics, University of California, Berkeley, California |

Department of Physics, Harvard University, Cambridge, Massachusetts |

Publication type: Journal Article

Publication date: 1968-01-10

American Physical Society (APS)

Journal: Physical Review A

Quartile SCImago

Quartile WOS

Impact factor: 2.9

ISSN: 24699926, 24699934, 0031899X, 10502947, 10941622

DOI: 10.1103/PhysRev.165.588

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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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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.

RIS |

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RIS Copy

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 -

BibTex |

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BibTex Copy

@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}

}

MLA

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MLA Copy

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.

Found error?

Publisher

American Physical Society (APS)

Journal

Physical Review A

Quartile SCImago

Quartile WOS

Impact factor

2.9

ISSN

24699926 (Print)
24699934 (Electronic)
0031899X (Print)
10502947 (Print)
10941622 (Electronic)