Fermi surface and extended vanHove singularity in the noncuprate superconductor Sr2RuO4

被引：101

作者：

Lu, DH ^{[1
]}

Schmidt, M ^{[1
]}

Cummins, TR ^{[1
]}

Schuppler, S ^{[1
]}

Lichtenberg, F ^{[1
]}

Bednorz, JG ^{[1
]}

机构：

[1] IBM CORP,DIV RES,ZURICH RES LAB,CH-8803 RUSCHLIKON,SWITZERLAND

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.76.4845

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We mapped the Fermi surface of the first copper-free layered perovskite superconductor, Sr2RuO4, by high-resolution (approximate to 22 meV) angle-resolved photoemission. Three bands cross the Fermi energy, consistent with band structure calculations; one around <(Gamma)over bar> and two around (X) over bar. The highlight is the observation of an extended van Hove singularity located 17 meV below the fermi level. It extends around (M) over bar for approximate to 0.2 Angstrom(-1) along <(Gamma)over bar>-(M) over bar-<(Gamma$)over bar> and (X) over bar-(M) over bar-(X) over bar in the projected Brillouin zone. This raises important questions related to the possible role of a van Hove singularity for oxide superconductivity.

引用

页码：4845 / 4848

页数：4