Share Email Print
cover

Proceedings Paper

Femtosecond photoimpedance response and dynamic structural distortions in YBCO samples
Author(s): 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
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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 Tc 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 YBa2Cu3O7-(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 Tc, with discontinuities which track Tc. 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.

Paper Details

Date Published: 22 December 1998
PDF: 16 pages
Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); doi: 10.1117/12.335873
Show Author Affiliations
T. Venkatesan, Univ. of Maryland/College Park (United States)
Rajeshwar P. Sharma, Univ. of Maryland/College Park (United States)
Ramamoorthy Ramesh, Univ. of Maryland/College Park (United States)
Yang G. Zhao, Univ. of Maryland/College Park (United States)
Insik Jin, Univ. of Maryland/College Park (United States)
Satish B. Ogale, Univ. of Maryland/College Park (India)
M. Rajeswari, Univ. of Maryland/College Park (United States)
Hua Zhang, Univ. of Houston (United States)
J. R. Liu, Univ. of Houston (United States)
Wei-Kan Chu, Univ. of Houston (United States)
Boyd W. Veal, Argonne National Lab. (United States)
Arvydas P. Paulikas, Argonne National Lab. (United States)
H. Zheng, Argonne National Lab. (United States)
Chi Hsiang Lee, Univ. of Maryland/College Park (United States)
Wei-lou Cao, Univ. of Maryland/College Park (United States)
J. J. Li, Univ. of Maryland/College Park (United States)
G. Baskaran, Institute of Mathematical Sciences (India)


Published in SPIE Proceedings Vol. 3481:
Superconducting and Related Oxides: Physics and Nanoengineering III
Davor Pavuna; Ivan Bozovic, Editor(s)

© SPIE. Terms of Use
Back to Top