Evidence for abrupt change in dispersion and scattering rate of quasiparticles in Bi2Sr2CaCu2O8

Authors
Lanzara, A Bogdanov, PV Kellar, SA Zhou, XJ Lu, ED Gu, G Shimoyama, JI Kishio, K Hussain, Z Shen, ZX
Citation
A. Lanzara et al., Evidence for abrupt change in dispersion and scattering rate of quasiparticles in Bi2Sr2CaCu2O8, J PHYS CH S, 62(1-2), 2001, pp. 21-24
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
ISSN journal
00223697 → ACNP
Volume
62
Issue
1-2
Year of publication
2001
Pages
21 - 24
Database
ISI
SICI code
0022-3697(200101/02)62:1-2<21:EFACID>2.0.ZU;2-U
Abstract
We report high-resolution ARPES data from Bi2Sr2CaCu2O8 superconductors as a function of doping and temperature. A clear break in the quasiparticle di spersion near 50 +/- 10 meV binding energy has been observed, resulting in a change of the quasiparticle velocity up to a factor of two or more. This break is present at various points of the momentum space, and the magnitude of the dispersion change decreases with temperature and with doping. (C) 2 000 Published by Elsevier Science Ltd.