Fermi surface and band dispersion in La2-xSrxCuO4

被引：117

作者：

Ino, A ^{[1
]}

Kim, C

Mizokawa, T

Shen, ZX

Fujimori, A

Takaba, M

Tamasaku, K

Eisaki, H

Uchida, S

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[3] Stanford Univ, Stanford Synchrotron Radiat Lab, Stanford, CA 94305 USA

[4] Univ Tokyo, Dept Superconduct, Bunkyo Ku, Tokyo 1130033, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1999年 / 68卷 / 05期

关键词：

La2-xSrxCuO4; ARPES; Fermi surface; band dispersion; superconducting gap; doping dependence;

D O I：

10.1143/JPSJ.68.1496

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using angle-resolved photoemission spectroscopy (ARPES), we observe the band structure, the Fermi surface and their doping dependences in La2-xSrxCuO4. The results reveal that the Fermi surface undergoes a dramatic change: it is holelike and centered at (pi,pi) in underdoped (x = 0.1) and optimally doped (x = 0.15) samples as in other cuprates, while it is electronlike and centered at (0.0) in heavily overdoped (x = 0.3) ones. The peak in the ARPES spectra near (pi/2,pi/2) is broad and weak unlike that in other cuprates. In the underdoped and optimally doped samples, a superconducting gap (Delta = 10-15 meV) is observed near (pi, 0).

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页码：1496 / 1499

页数：4

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