RESONANT PHOTOEMISSION-STUDY OF ND2-XCEXCUO4-Y - NATURE OF ELECTRONIC STATES NEAR THE FERMI LEVEL

被引:213
作者
ALLEN, JW
OLSON, CG
MAPLE, MB
KANG, JS
LIU, LZ
PARK, JH
ANDERSON, RO
ELLIS, WP
MARKERT, JT
DALICHAOUCH, Y
LIU, R
机构
[1] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545
[2] IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011
[3] UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093
[4] UNIV CALIF SAN DIEGO,INST PURE & APPL PHYS SCI,LA JOLLA,CA 92093
[5] IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011
关键词
D O I
10.1103/PhysRevLett.64.595
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The electronic structures of single-crystal and ceramic samples of the electron-doped superconductor Nd2-xCexCuO4-y with x=0 and 0.15 have been studied using resonant photoemission spectro- scopy. Comparing these spectra with previous results for La2-xSrxCuO4 shows that for both electron and hole doping the Fermi level lies at nearly the same energy, in states that fill in the x=0 insulator gap. We point out that this would occur if the states at the Fermi level obey a Luttinger-type sum rule, i.e., according to standard theory, if the metallic state is a normal Fermi liquid. © 1990 The American Physical Society.
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收藏
页码:595 / 598
页数:4
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