Electronic structure of layered perovskite-related Sr1-yLayNbO3.5-x

被引：22

作者：

Kuntscher, CA

Gerhold, S

Nücker, N

Cummins, TR

Lu, DH

Schuppler, S

Gopinath, CS

Lichtenberg, F

Mannhart, J

Bohnen, KP

机构：

[1] Forschungszentrum Karlsruhe, IFP, D-76021 Karlsruhe, Germany

[2] Univ Augsburg, Inst Phys, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany

来源：

PHYSICAL REVIEW B | 2000年 / 61卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.61.1876

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The electronic properties and the crystal structure of layered perovskite-related niobates Sr1-yLayNbO3.5-x can be tuned by gradually changing the oxygen stoichiometry. We have studied the electronic structure of this series in detail by angle-integrated and angle-resolved (ARPES) photoemission and x-ray absorption (NEXAFS) on SrNbO3.45 and Lao(0.1)Sr(0.9)NbO(3.39) single crystals. ARPES shows a one-dimensional dispersion and a purely one-dimensional Fermi surface with a nesting vector 2k(F)=0.56 Angstrom(-1). A strongly anisotropic electronic character appears in polarization-dependent O 1s NEXAFS as well. Local-density approximation (LDA) band-structure calculations support this dispersion behavior of the lowest-lying conduction band and find additional Fermi surface sheets with a more two-dimensional character.

引用

页码：1876 / 1883

页数：8

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