Decoupling the superconducting condensate from phonons in the far-infrared spectra of YBa2Cu3O7-x

Ricardo P. S. M. Lobo; Francisco J. Gotor; Philippe Odier; Francois Gervais

doi:10.1117/12.241748

10 June 1996 Decoupling the superconducting condensate from phonons in the far-infrared YBa₂Cu₃O_7-(delta

Ricardo P. S. M. Lobo, Francisco J. Gotor, Philippe Odier, Francois Gervais

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241748
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

The infrared reflection spectra of a YBa₂Cu₃O_7-(delta ) single crystal with a large surface containing the c-axis have been recorded from 4 k to room temperature. Thermal treatment of the sample allowed us to obtain spectra for several T_cs, ranging from 50 to 91.3 K on the same sample. The obtained results along the c-axis show an extra band in the superconducting phase which can be attributed to the formation of Cooper pairs. By decoupling this extra absorption from phonons and unpaired charge carries, we have determined the thermal evolution of the London penetration depth and the concentration of pairs along the c-axis as a function of T_c. The observed effects are compared to the BCS theory.

Citation Download Citation

Ricardo P. S. M. Lobo, Francisco J. Gotor, Philippe Odier, and Francois Gervais "Decoupling the superconducting condensate from phonons in the far-infrared YBa₂Cu₃O_7-(delta", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241748

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