Chemical potential shift, density of states and Fermi surfaces in overdoped and underdoped La2-xSrxCuO4

Authors
Fujimori, A Ino, A Mizokawa, T Kim, C Shen, ZX Sasagawa, T Kimura, T Kishio, K Takaba, M Tamasaku, K Eisaki, H Uchidau, S
Citation
A. Fujimori et al., Chemical potential shift, density of states and Fermi surfaces in overdoped and underdoped La2-xSrxCuO4, J PHYS CH S, 59(10-12), 1998, pp. 1892-1896
Citations number
30
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
ISSN journal
00223697 → ACNP
Volume
59
Issue
10-12
Year of publication
1998
Pages
1892 - 1896
Database
ISI
SICI code
0022-3697(199810/12)59:10-12<1892:CPSDOS>2.0.ZU;2-
Abstract
We have made photoemission studies of La2-xSrxCuO4 (LSCO) and found the fol lowing: (1) suppression of the chemical potential (mu) shift fur small x in dicates a breakdown of the Fermi-liquid picture in the underdoped regime an d suggests the opening of a pseudogap: (2) valence band spectra have indeed shown a pseudogap whose magnitude increases with decreasing x. simultaneou sly the density of states (DOS) at mu diminishes;(3) ARPES measurements hav e revealed changes from an electron-like Fermi surface in the overdoped reg ime to a hole-like one in the underdoped regime. (C) 1998 Elsevier Science Ltd. All rights reserved.