Femtosecond photoimpedance response and dynamic structural distortions in YBCO samples

T. Venkatesan; Rajeshwar P. Sharma; Ramamoorthy Ramesh; Yang G. Zhao; Insik Jin; Satish B. Ogale; M. Rajeswari; Hua Zhang; J. R. Liu; Wei-Kan Chu; Boyd W. Veal; Arvydas P. Paulikas; H. Zheng; Chi Hsiang Lee; Wei-lou Cao; J. J. Li; G. Baskaran

doi:10.1117/12.335873

22 December 1998 Femtosecond photoimpedance response and dynamic structural distortions in YBCO samples

T. Venkatesan, Rajeshwar P. Sharma, Ramamoorthy Ramesh, Yang G. Zhao, Insik Jin, Satish B. Ogale, M. Rajeswari, Hua Zhang, J. R. Liu, Wei-Kan Chu, Boyd W. Veal, Arvydas P. Paulikas, H. Zheng, Chi Hsiang Lee, Wei-lou Cao, J. J. Li, G. Baskaran

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Proceedings Volume 3481, Superconducting and Related Oxides: Physics and Nanoengineering III; (1998) https://doi.org/10.1117/12.335873
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Two novel experiments, one concerned with the fast optical response related to Cooper pair breaking using femto-second laser pulses in YBCO films and the second related to uncorrelated dynamic distortions as a function of oxygen concentration for YBCO single crystals by ion channeling, have provided information that may be relevant for understanding the mechanism of superconductivity in high T_c superconductors. In the first case a dramatic resonant photon energy dependence around 1.5 eV in the pair breaking rate has been observed, suggesting that an intermediate excitation may be playing an important role in the depairing process. In the second experiment, ion channeling investigations in YBa₂Cu₃O_7-(delta ) ((delta) equals 0.05 to 0.8) crystals have clearly shown an evolution of the lattice from that of a Debye solid for (delta) equals 0.8 to one exhibiting significant lattice coherence even at much higher temperatures than T_c, with discontinuities which track T_c. These two experimental results are discussed in the light of different mechanisms including the formation of Zhang-Rice singlet or other mechanisms that lead to a non local hole.

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T. Venkatesan, Rajeshwar P. Sharma, Ramamoorthy Ramesh, Yang G. Zhao, Insik Jin, Satish B. Ogale, M. Rajeswari, Hua Zhang, J. R. Liu, Wei-Kan Chu, Boyd W. Veal, Arvydas P. Paulikas, H. Zheng, Chi Hsiang Lee, Wei-lou Cao, J. J. Li, and G. Baskaran "Femtosecond photoimpedance response and dynamic structural distortions in YBCO samples", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); https://doi.org/10.1117/12.335873

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KEYWORDS

Superconductors

Ions

Crystals

Oxygen

Copper

Doping

Superconductivity

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