Evolution of electronic structure from insulator to superconductor in Bi2Sr2-xLax(Ca,Y )Cu2 O 8+δ
Abstract
La-doped and Y-doped Bi2 Sr2 CaCu2 O 8+δ compounds Bi2Sr2-xLax(Ca,Y )Cu2 O8+δ, which range from the insulator to the deeply underdoped superconductor, have been studied by angle-resolved photoemission spectroscopy. We have observed that the lower Hubbard band (LHB) of the parent insulator is gradually shifted upward with doping without significantly changing the band dispersions, which implies a downward shift of the chemical potential with hole doping. This behavior is analogous to Bi 2Sr2-xLax CuO6+δ and Ca 2-x Nax CuO2 Cl2 but is different from La2-x Srx CuO4, where the LHB stays well below the chemical potential and does not move while its intensity quickly diminishes in the underdoped region. © 2010 The American Physical Society.
Date Published
Journal
Physical Review B - Condensed Matter and Materials Physics
Volume
81
Issue
12
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-77955166689&doi=10.1103%2fPhysRevB.81.125115&partnerID=40&md5=d531bed6ddbab9fa11a7600fa82b0da8
DOI
10.1103/PhysRevB.81.125115
Research Area
Group (Lab)
Kyle Shen Group