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Optical Properties of Dopant Induced States in La2−xSrxCuO4-δ Compounds

Published online by Cambridge University Press:  28 February 2011

S. Etemad ,
D. E. Aspnes ,
P. Barboux ,
G. W. Hull ,
M. K. Kelly ,
J. M. Tarascon ,
R. Thompson ,
S. L. Herr ,
K. Kamaras  and
C. D. Porter
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S. Etemad
Affiliation:
Bell Communications Research, Red Bank NJ 07701
D. E. Aspnes
Affiliation:
Bell Communications Research, Red Bank NJ 07701
P. Barboux
Affiliation:
Bell Communications Research, Red Bank NJ 07701
G. W. Hull
Affiliation:
Bell Communications Research, Red Bank NJ 07701
M. K. Kelly
Affiliation:
Bell Communications Research, Red Bank NJ 07701
J. M. Tarascon
Affiliation:
Bell Communications Research, Red Bank NJ 07701
R. Thompson
Affiliation:
Bell Communications Research, Red Bank NJ 07701
S. L. Herr
Affiliation:
University of Florida, Gainsville FL 32611
K. Kamaras
Affiliation:
University of Florida, Gainsville FL 32611
C. D. Porter
Affiliation:
University of Florida, Gainsville FL 32611
D. B. Tanner
Affiliation:
University of Florida, Gainsville FL 32611
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Abstract

Optical data over a broad energy range (∼ 0.01 eV to ∼ 6 eV) for a series of La2−xSrxCuO4-δ compounds are obtained in parallel with the Meissner effect and the superconductivity transition temperature, Tc. Two noteworthy trends in the optical spectra are observed as the Sr concentration is increased in small steps from x = 0 to x = 0.3. First is the appearance of a low frequency band in the reflectivity, R, whose strength follows closely the Meissner effect and Tc measured on the same set of samples. The position of the onset of this band is pinned at ∼0.9 eV for all values of x. The origin of this band in R is identified as an absorption process due to an electronic transition with a large oscillator strength. Second is the appearance and disappearance of an intense vibrational mode whose strength also tracks “superconductivity”. This sharp structure in the far infrared is a characteristic vibrational mode associated with the dopant induced electronic state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 135
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

1. Etemad, S., Aspnes, D.E., Kelly, M.K., Thompson, R., Tarascon, J.-M., and Hull, G.W., to be published. Highlights of this work can be found in the Proceedings of the International Conference on High Temperature Superconductivity, Trieste (Italy) June 1987; Edited by Yu Lu and S. Lundquist, World Scientific Publishers (Singapore), in press.Google Scholar
2. Tajima, S., Uchida, S., Tanaka, S., Kanbe, S., Kitazawa, K. and Fueki, K., Japonese J. Appl. Phys. 26 (1987).Google Scholar
3. Kamaras, K., Porter, C.D., Doss, M.G., Herr, S.L., Tanner, D.B., Bonn, D.A., Greedan, J.E., O'Reilly, A.H., Stager, C.V., and Timusk, T., Phys. Rev. Lett. 59, 919(1987).Google Scholar
4. Herr, S. L., Kamaras, K., Porter, C.D., Tanner, D.B., Etemad, S., Aspnes, D.E., Kelly, M.K., and Tarascon, J.M. to be published.Google Scholar
5. In extending the measurements to FIR region we find that the absolute scale for R in Figure 1 that is set by the ellipsometry measurements is too high. Δ(Ω) are obtained by extrapolating the zero frequency value of R at low temperatures to unity.Google Scholar
6. Herr, S.L., Kamaras, K., Porter, C.D., Doss, M.G., Tanner, D.B., Bonn, D.A., Greedan, J.E., Stager, C.V. and Timusk, T., Phys. Rev. B36, 733(1987).Google Scholar
7. Sulewski, P.E., Noh, T.W., MaWhirter, J.T., and Sievers, A.J., Phys. Rev. B36, 5735(1987).Google Scholar
8. Thomas, G.A., Millis, A.J., Bhatt, R.N., Cava, R.J., Reitman, E.A., Phys. Rev. B35, (1987).Google Scholar
9. Rice, M.J. Phys. Rev. Lett. 37, 36(1976); andGoogle Scholar
Rice, M.J. Solid State Commun. 31, 93(1979).Google Scholar
10. As an example see Etemad, S., Phys. Rev. 24, 4959(1987) for study of Peierls distortion in TTF-TCNQ.Google Scholar
11. Pinkerton, F.E., Webb, B.C., Sievers, A.J., Wilkins, J.W., and Sham, L.J., Phys. Rev. B30, 3068(1984).Google Scholar
12. Koida, T., Fukutani, H., Fujimori, A., Suzuki, R., Shidara, T., Takahashi, T., Hosoya, S., and Sato, M. (preprint).Google Scholar
13. The optical study at University of Tokyo communicated by S. Tanaka in the Proceedings of the International Conference on High Temperature Superconductivity, Trieste (Italy).June 1987; Edited by Yu Lu and S. Lundquist, World Scientific Publishers (Singapore), in press.Google Scholar
14. Schlesinger, Z., Collins, R.T., Kaiser, D.L. and Hotzberg, F., Phys. Rev. Lett. 59, 1958(1987).Google Scholar
15. Orenstein, J. and D.H.Rapkine, comment on Reference 3.Google Scholar
16. We note that all of the single crystal and oriented film reflection results cannot be fitted satisfactorily to a Drude expression.Google Scholar
17. Tarascon, J.M., Greene, L.H., Barboux, P., McKinnon, W.R., Hull, G.W., Orlando, T.P., Delin, K.A., Foner, S. and McNiff, E.J. Jr, Phys. Rev. B December 1987.Google Scholar