ON THE FERMI-SURFACE OF YBA2CU3O7-DELTA

被引：24

作者：

PETER, M

MANUEL, AA

HOFFMANN, L

SADOWSKI, W

机构：

来源：

EUROPHYSICS LETTERS | 1992年 / 18卷 / 4BIS期

关键词：

MEASUREMENT OF FERMI SURFACE PARAMETERS; PEROVSKITE PHASE SUPERCONDUCTORS; POSITRON ANNIHILATION;

D O I：

10.1209/0295-5075/18/4/006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the signature of a Fermi surface sheet of YBa2Cu3O7-delta may be obtained unambiguously from twinned crystals. Comparison of electron-positron momentum density from YBa2Cu3O7-delta measured both in insulating and (superconducting) twinned phases leads to a decisive further proof of the existence of the Fermi surface in the metallic YBa2Cu3O7-delta. In addition, measurements on untwinned YBa2Cu3O7-delta single crystals reveal also a <<ridge>> Fermi surface sheet attributed by band structure calculations to CuO chains.

引用

页码：313 / 317

页数：5

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