Far-Infrared Absorption in Superconducting Niobium Alloys

R. L. Cappelletti; D. M. Ginsberg; J. K. Hulm

doi:10.1103/PhysRev.158.340

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Far-Infrared Absorption in Superconducting Niobium Alloys

R. L. Cappelletti^* and D. M. Ginsberg

J. K. Hulm

Department of Physics, University of Illinois, Urbana, Illinois

Westinghouse Research Laboratories, Pittsburgh, Pennsylvania

^*Present address: Physics Department, Iowa State University, Ames, Iowa.

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Phys. Rev. 158, 340 – Published 10 June, 1967

DOI: https://doi.org/10.1103/PhysRev.158.340

Abstract

Far-infrared measurements have been made to determine the superconducting energy gap widths in bulk samples of binary alloys in the system Zr-Nb-Mo. The variation of the gap width $2 Δ$ with concentration is qualitatively similar to the variation of the critical temperature $T_{c}$ . There is a marked variation in the BCS coupling constant $V$ . The relation between $\frac{2 Δ}{k T_{c}}$ and $V$ is opposite to that in the simple metals.

References (42)

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J. Bardeen, L. N. Cooper, and J. R. Schrieffer, Phys. Rev. 108, 1175 (1957)
P. Morel and P. W. Anderson, Phys. Rev. 125, 1263 (1962)
J. W. Garland, Jr., Phys. Rev. Letters 11, 114 (1963) (to be published)
B. T. Matthias, in Progress in Low-Temperature Physics, edited by C. J. Gorter (North-Holland Publishing Company, Amsterdam, 1957), Vol. II
J. K. Hulm and R. D. Blaugher, Phys. Rev. 123, 1569 (1961)
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[15]
J. C. Swihart, D. J. Scalapino, and J. Wada, Phys. Rev. Letters 14, 106 (1965)
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Omitted endnote
Omitted endnote
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[16]
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B. W. Veal, J. K. Hulm, and R. D. Blaugher, Ann. Acad. Sci. Fennicae, Ser. A VI 210, 108 (1966)
Omitted endnote
G. D. Kneip, Jr., J. O. Betterton, Jr., and J. O. Scarbrough, Phys. Rev. 130, 1687 (1963)
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Omitted endnote
M. A. Jensen and J. P. Maita, Phys. Rev. 149, 409 (1966)
[7,41]
C. H. Cheng et al., Phys. Rev. 126, 2030 (1962)
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Ph.D. thesis of R. L. Cappelletti, University of Illinois, 1966 (unpublished)

[c1] D. H. Douglass, Jr., and L. M. Falicov, in Progress in Low-Temperature Physics, edited by C. J. Gorter (North-Holland Publishing Company, Amsterdam, 1964), Vol. IV

[c2] J. Bardeen, L. N. Cooper, and J. R. Schrieffer, Phys. Rev. 108, 1175 (1957)

[c3] P. Morel and P. W. Anderson, Phys. Rev. 125, 1263 (1962)

[c4] J. W. Garland, Jr., Phys. Rev. Letters 11, 114 (1963) (to be published)

[c5] B. T. Matthias, in Progress in Low-Temperature Physics, edited by C. J. Gorter (North-Holland Publishing Company, Amsterdam, 1957), Vol. II

[c6] J. K. Hulm and R. D. Blaugher, Phys. Rev. 123, 1569 (1961)

[c7] F. J. Morin and J. P. Maita, Phys. Rev. 129, 1115 (1963)

[c8] D. Pines, Phys. Rev. 109, 280 (1958)

[c9] B. Muhlschlegel, Z. Physik 155, 313 (1959)

[c10] P. W. Anderson, J. Phys. Chem. Solids 11, 26 (1959)

[c11] D. Markowitz and L. P. Kadanoff, Phys. Rev. 131, 563 (1963)

[c12] P. L. Richards, Phys. Rev. Letters 7, 412 (1961)

[c13] W. V. Budzinski and M. P. Garfunkel, Phys. Rev. Letters 17, 24 (1966)

[c14] [15]

[c15] J. C. Swihart, D. J. Scalapino, and J. Wada, Phys. Rev. Letters 14, 106 (1965)

[c16] P. L. Richards and M. Tinkham, Phys. Rev. 119, 575 (1960)

[c17] J. D. Leslie and D. M. Ginsberg, Phys. Rev. 133, A362 (1964)

[c18] I. Dietrich, Phys. Letters 9, 221 (1964)

[c19] J. D. Leslie et al., Phys. Rev. 134, A309 (1964)

[c20] Omitted endnote

[c21] Omitted endnote

[c22] R. G. Wheeler and J. C. Hill, J. Opt. Soc. Am. 56, 657 (1966)

[c23] C. Nuese (private communication)

[c24] [25]

[c25] C. K. Jones and J. K. Hulm, Rev. Mod. Phys. 36, 74 (1964)

[c26] M. D. Sherrill and H. H. Edwards, Phys. Rev. Letters 6, 460 (1961)

[c27] P. Townsend and J. Sutton, Phys. Rev. 128, 591 (1962)

[c28] [16]

[c29] D. K. Finnemore, T. F. Stromberg, and C. A. Swenson, Phys. Rev. 149, 231 (1966)

[c30] B. J. C. Van der Hoeven, Jr., and P. H. Keesom, Phys. Rev. 134, A1320 (1964)

[c31] H. A. Leupold and H. A. Boorse, Phys. Rev. 134, A1322 (1964)

[c32] R. D. Blaugher et al., in Proceedings of the Eighth International Conference on Low-Temperature Physics, London, 1962, edited by R. O. Davies (Butterworths Scientific Publications Ltd., London, 1963), p. 147

[c33] B. W. Veal, J. K. Hulm, and R. D. Blaugher, Ann. Acad. Sci. Fennicae, Ser. A VI 210, 108 (1966)

[c34] Omitted endnote

[c35] G. D. Kneip, Jr., J. O. Betterton, Jr., and J. O. Scarbrough, Phys. Rev. 130, 1687 (1963)

[c36] R. A. Hein, J. W. Gibson, and R. D. Blaugher, Rev. Mod. Phys. 36, 149 (1964) [32]

[c37] Omitted endnote

[c38] M. A. Jensen and J. P. Maita, Phys. Rev. 149, 409 (1966)

[c39] [7,41]

[c40] C. H. Cheng et al., Phys. Rev. 126, 2030 (1962)

[c41] E. Bucher et al., in Low-Temperature Physics LT9, edited by J. G. Daunt (Plenum Press, Inc., New York, 1965), Part A, p. 616

[c42] Ph.D. thesis of R. L. Cappelletti, University of Illinois, 1966 (unpublished)

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Far-Infrared Absorption in Superconducting Niobium Alloys

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