Carrier relaxation and localisation in Bi2Sr2Ca1-yYyCu2O8 and YBa2Cu3O7-d: a study by femtosecond time-resolved spectroscopy

Chris J. Stevens; T. N. Thomas; S. Choudhary; John F. Ryan; Dragan Mihailovic; Laszlo Forro; Gunter A. Wagner; J. E. Evetts

doi:10.1117/12.241801

10 June 1996 Carrier relaxation and localisation in Bi₂Sr₂Ca_1-yY_yCu₂O₈ and YBa₂Cu₃O_7-delta : a study by femtosecond time-resolved spectroscopy

Chris J. Stevens, T. N. Thomas, S. Choudhary, John F. Ryan, Dragan Mihailovic, Laszlo Forro, Gunter A. Wagner, J. E. Evetts

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241801
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Ultrafast time-resolved optical absorption has been measured as a function of doping and temperature in the high temperature superconductors Bi₂Sr₂Ca_1-yY_yCu₂O₈ (0 less than y less than 1) and YBa₂Cu₃O_7-(delta ) (0.06 less than 1). A fast transient response is observed, which changes sign as a function of y in Bi₂Sr₂Ca_1-yY_yCu₂O₈ and in YBa₂Cu₃O_7-(delta ). Careful consideration of the possible mechanisms for the observed behavior lead us to suggest that two independent mechanisms are operating, whereby the two observed positive photoinduced absorption components are due to the electrodynamic response of photoinduced carriers, while the negative signal arises due to spectral hole burning. In the metallic samples a long-lived component is observed, which we suggest comes from photoinduced localized states intrinsic only to the superconducting species of the high-T_c materials. A very significant increase in the scattering rate (1/(tau) ) at temperatures just above T_c signifies coupling to charge and possibly spin fluctuations just above T_c. A large reduction in scattering rate is observed below T_c, similar to that observed previously in YBa₂Cu₃O_6.9 and Tl₂Ba₂CaCu₂O₈.

Citation Download Citation

Chris J. Stevens, T. N. Thomas, S. Choudhary, John F. Ryan, Dragan Mihailovic, Laszlo Forro, Gunter A. Wagner, and J. E. Evetts "Carrier relaxation and localisation in Bi₂Sr₂Ca_1-yY_yCu₂O₈ and YBa₂Cu₃O_7-delta : a study by femtosecond time-resolved spectroscopy", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241801

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Absorption

Doping

Superconductors

Temperature metrology

Ultrafast phenomena

Copper

Femtosecond phenomena

Show All Keywords

Keywords/Phrases

Search In:

Publication Years