Infrared studies of high Tc superconductors

T. Timusk, M. Reedyk, R. Hughes, D. A. Bonn, J. D. Garrett, J. E. Greedan, C. V. Stager, D. B. Tanner, Feng Gao, S. L. Herr, K. Kamarás, G. A. Thomas, S. L. Cooper, J. Orenstein, Lynn Schneemeyer, A. J. Millis

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Abstract

The infrared properties of the high temperature superconductors are dominated by the strong temperature dependent absorption of the free carriers at low frequency and a temperature independent midinfrared band. Dramatic changes in reflectance do occur as the material becomes superconducting but these changes cannot be used to determine the energy gap, since as a result of the development of the superconducting condensate, changes in the real part of the dielectric function dominate. Also, since the relaxation rate of the free carriers is of the order of 200 cm-1 at 100 K the materials are near the clean limit below this temperature and we do not expect to see structure at the energy of the superconducting gap. The reflectance edge observed in many experiments at 450 cm-1 is caused by the onset of the midinfrared absorption which has the character of a direct particle-hole excitation rather than the Holstein scattering of the free carriers.

Original languageEnglish
Pages (from-to)841-844
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume162-164
Issue numberPART 2
DOIs
StatePublished - 1 Jan 1989

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Superconducting materials
Infrared radiation
reflectance
High temperature superconductors
high temperature superconductors
Temperature
temperature
condensates
Energy gap
Scattering
low frequencies
scattering
excitation
Experiments
energy

Cite this

Timusk, T., Reedyk, M., Hughes, R., Bonn, D. A., Garrett, J. D., Greedan, J. E., ... Millis, A. J. (1989). Infrared studies of high Tc superconductors. Physica C: Superconductivity and its applications, 162-164(PART 2), 841-844. https://doi.org/10.1016/0921-4534(89)90489-9
Timusk, T. ; Reedyk, M. ; Hughes, R. ; Bonn, D. A. ; Garrett, J. D. ; Greedan, J. E. ; Stager, C. V. ; Tanner, D. B. ; Gao, Feng ; Herr, S. L. ; Kamarás, K. ; Thomas, G. A. ; Cooper, S. L. ; Orenstein, J. ; Schneemeyer, Lynn ; Millis, A. J. / Infrared studies of high Tc superconductors. In: Physica C: Superconductivity and its applications. 1989 ; Vol. 162-164, No. PART 2. pp. 841-844.
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Timusk, T, Reedyk, M, Hughes, R, Bonn, DA, Garrett, JD, Greedan, JE, Stager, CV, Tanner, DB, Gao, F, Herr, SL, Kamarás, K, Thomas, GA, Cooper, SL, Orenstein, J, Schneemeyer, L & Millis, AJ 1989, 'Infrared studies of high Tc superconductors', Physica C: Superconductivity and its applications, vol. 162-164, no. PART 2, pp. 841-844. https://doi.org/10.1016/0921-4534(89)90489-9

Infrared studies of high Tc superconductors. / Timusk, T.; Reedyk, M.; Hughes, R.; Bonn, D. A.; Garrett, J. D.; Greedan, J. E.; Stager, C. V.; Tanner, D. B.; Gao, Feng; Herr, S. L.; Kamarás, K.; Thomas, G. A.; Cooper, S. L.; Orenstein, J.; Schneemeyer, Lynn; Millis, A. J.

In: Physica C: Superconductivity and its applications, Vol. 162-164, No. PART 2, 01.01.1989, p. 841-844.

Research output: Contribution to journalArticleResearchpeer-review

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AB - The infrared properties of the high temperature superconductors are dominated by the strong temperature dependent absorption of the free carriers at low frequency and a temperature independent midinfrared band. Dramatic changes in reflectance do occur as the material becomes superconducting but these changes cannot be used to determine the energy gap, since as a result of the development of the superconducting condensate, changes in the real part of the dielectric function dominate. Also, since the relaxation rate of the free carriers is of the order of 200 cm-1 at 100 K the materials are near the clean limit below this temperature and we do not expect to see structure at the energy of the superconducting gap. The reflectance edge observed in many experiments at 450 cm-1 is caused by the onset of the midinfrared absorption which has the character of a direct particle-hole excitation rather than the Holstein scattering of the free carriers.

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Timusk T, Reedyk M, Hughes R, Bonn DA, Garrett JD, Greedan JE et al. Infrared studies of high Tc superconductors. Physica C: Superconductivity and its applications. 1989 Jan 1;162-164(PART 2):841-844. https://doi.org/10.1016/0921-4534(89)90489-9