PAIR MOMENTUM DISTRIBUTION IN BI2SR2CACU2O8+DELTA MEASURED BY POSITRON-ANNIHILATION - EXISTENCE AND NATURE OF THE FERMI-SURFACE

被引：37

作者：

CHAN, LP

HARSHMAN, DR

LYNN, KG

MASSIDDA, S

MITZI, DB

机构：

[1] AT&T BELL LABS, N ANDOVER, MA 01845 USA

[2] PHB ECUBLENS, INST ROMAND RECH NUMER PHYS MAT, CH-105 LAUSANNE, SWITZERLAND

[3] STANFORD UNIV, DEPT PHYS, STANFORD, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.67.1350

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first measurement of the positron-electron momentum density in superconducting single-crystal Bi2Sr2CaCu2O8 + delta (T(c) almost-equal-to 90 K). The observed anisotropy exhibits a twofold (rather than fourfold) symmetry, which is attributed to the superlattice modulation along the b axis of the BiO2 layers. Subtraction of the superlattice contribution also reveals a pair momentum distribution consistent with the CuO2 and BiO2 Fermi surfaces, and in reasonable agreement with the theoretical pair momentum density derived from band theory.

引用

页码：1350 / 1353

页数：4

共 26 条

[1] ELECTRON-POSITRON DENSITY-FUNCTIONAL THEORY [J].