Evidence for two coupled subsystems in the superconducting state of La2-xSrxCuO4 - art. no. 214505

Authors
Rast, S Schneider, ML Onellion, M Zeng, XH Si, WD Xi, XX Abrecht, M Ariosa, D Pavuna, D Ren, YH Lupke, G Perakis, I
Citation
S. Rast et al., Evidence for two coupled subsystems in the superconducting state of La2-xSrxCuO4 - art. no. 214505, PHYS REV B, 6421(21), 2001, pp. 4505
Citations number
23
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6421
Issue
21
Year of publication
2001
Database
ISI
SICI code
0163-1829(200112)6421:21<4505:EFTCSI>2.0.ZU;2-4
Abstract
We used a pump-probe technique to measure the transient change of optical r eflectivity of both La2-xSrxCuO4, of various dopings, and slightly underdop ed YBa2Cu3O7-x and NdBa2Cu3O7-x thin films. For the La2-xSrxCuO4 films, our data demonstrate the coexistence, in the superconducting state, of two cou pled subsystems with different relaxation times and different contributions to the optical reflectivity. One subsystem is associated with the supercon ducting phase. By contrast. the data from YBa2Cu3O7-x, and NdBa2Cu3O7-x sho ws that the coupling between the two subsystems is weak or absent.