Apparent Superconducting Energy Gap in Lead from Ultrasonic Measurements

B. R. Tittmann; H. E. Bömmel

doi:10.1103/PhysRev.151.189

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Apparent Superconducting Energy Gap in Lead from Ultrasonic Measurements

B. R. Tittmann and H. E. Bömmel^*

Department of Physics, University of California, Los Angeles, California

^*Also at North American Aviation Science Center, Thousand Oaks, California.

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Phys. Rev. 151, 189 – Published 4 November, 1966

DOI: https://doi.org/10.1103/PhysRev.151.189

Abstract

The apparent superconducting energy gap in lead was obtained from ultrasonic measurements in the range of $kl \leq 1$ . The gap parameter is about $5.0 k_{b} T_{c}$ and is approximately frequency-independent over the range from 50 to 1050 Mc/sec.

References (10)

R. E. Love and R. W. Shaw, Rev. Mod. Phys. 36, 260 (1964)
R. E. Love, R. W. Shaw, and W. A. Fate, Phys. Rev. 138, A1453 (1965)
D. J. Scalapino, Y. Wada, and J. C. Swihart, Phys. Rev. Letters 14, 102 (1965)
J. Bardeen, L. N. Cooper, and J. R. Schrieffer, Phys. Rev. 108, 1175 (1957)
R. W. Morse, Progress in Cryogenics, (Heywood and Company, Ltd., London, 1959), Vol. 1
B. R. Tittmann and H. E. Bömmel, Bull. Am. Phys. Soc. 9, 713 (1965)
B. R. Tittmann and H. E. Bömmel, Phys. Rev. Letters 14, 296 (1965)
B. R. Tittmann and H. E. Bömmel, Phys. Rev. 151, 178 (1966)
B. R. Tittmann, University of California at Los Angeles, Ph.D. dissertation, 1965 (unpublished)
B. Mühlschlegel, Z. Physik 155, 313 (1959)

[c1] R. E. Love and R. W. Shaw, Rev. Mod. Phys. 36, 260 (1964)

[c2] R. E. Love, R. W. Shaw, and W. A. Fate, Phys. Rev. 138, A1453 (1965)

[c3] D. J. Scalapino, Y. Wada, and J. C. Swihart, Phys. Rev. Letters 14, 102 (1965)

[c4] J. Bardeen, L. N. Cooper, and J. R. Schrieffer, Phys. Rev. 108, 1175 (1957)

[c5] R. W. Morse, Progress in Cryogenics, (Heywood and Company, Ltd., London, 1959), Vol. 1

[c6] B. R. Tittmann and H. E. Bömmel, Bull. Am. Phys. Soc. 9, 713 (1965)

[c7] B. R. Tittmann and H. E. Bömmel, Phys. Rev. Letters 14, 296 (1965)

[c8] B. R. Tittmann and H. E. Bömmel, Phys. Rev. 151, 178 (1966)

[c9] B. R. Tittmann, University of California at Los Angeles, Ph.D. dissertation, 1965 (unpublished)

[c10] B. Mühlschlegel, Z. Physik 155, 313 (1959)

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Apparent Superconducting Energy Gap in Lead from Ultrasonic Measurements

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References (10)

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