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; L. F. Schneemeyer; A. J. Millis

doi:10.1016/0921-4534(89)90489-9

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, L. F. 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 language	English (US)
Pages (from-to)	841-844
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	162-164
Issue number	PART 2
DOIs	https://doi.org/10.1016/0921-4534(89)90489-9
State	Published - Dec 1989
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(89)90489-9

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

@article{15eac531d4bb4efd90964f5243d5f18c,

title = "Infrared studies of high Tc superconductors",

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.",

author = "T. Timusk and M. Reedyk and R. Hughes and Bonn, {D. A.} and Garrett, {J. D.} and Greedan, {J. E.} and Stager, {C. V.} and Tanner, {D. B.} and Feng Gao and Herr, {S. L.} and K. Kamar{\'a}s and Thomas, {G. A.} and Cooper, {S. L.} and J. Orenstein and Schneemeyer, {L. F.} and Millis, {A. J.}",

note = "Funding Information: ACKNOWLEDGEMENTS The work at McMaster is supported by the National Science and Engineering Research Council (NSERC) and the Canadian Institute of Advanced Research (CIAR). The support in Florida comes from DARPA through contract MDA972-88-J-1006. At McMaster we thank C. Kallin for many illuminating discussions. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

year = "1989",

month = dec,

doi = "10.1016/0921-4534(89)90489-9",

language = "English (US)",

volume = "162-164",

pages = "841--844",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "PART 2",

}

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, LF & 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

TY - JOUR

T1 - Infrared studies of high Tc superconductors

AU - Timusk, T.

AU - Reedyk, M.

AU - Hughes, R.

AU - Bonn, D. A.

AU - Garrett, J. D.

AU - Greedan, J. E.

AU - Stager, C. V.

AU - Tanner, D. B.

AU - Gao, Feng

AU - Herr, S. L.

AU - Kamarás, K.

AU - Thomas, G. A.

AU - Cooper, S. L.

AU - Orenstein, J.

AU - Schneemeyer, L. F.

AU - Millis, A. J.

N1 - Funding Information: ACKNOWLEDGEMENTS The work at McMaster is supported by the National Science and Engineering Research Council (NSERC) and the Canadian Institute of Advanced Research (CIAR). The support in Florida comes from DARPA through contract MDA972-88-J-1006. At McMaster we thank C. Kallin for many illuminating discussions. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 1989/12

Y1 - 1989/12

N2 - 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.

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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VL - 162-164

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JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

IS - PART 2

ER -

Infrared studies of high Tc superconductors

Abstract

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