Fermi surface topology of Ca1.5Sr0.5RuO4 determined by angle-resolved photoelectron spectroscopy -: art. no. 177007

被引：35

作者：

Wang, SC ^{[1
]}

Yang, HB

Sekharan, AKP

Souma, S

Matsui, H

Sato, T

Takahashi, T

Lu, CX

Zhang, JD

Jin, R

Mandrus, D

Plummer, EW

Wang, Z

Ding, H

机构：

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[2] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[3] Florida Int Univ, Dept Phys, Miami, FL 33199 USA

[4] Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 17期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.93.177007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report angle-resolved photoelectron spectroscopy results of the Fermi surface of Ca1.5Sr0.5RuO4, which is at the boundary of magnetic/orbital instability in the phase diagram of the Ca-substituted Sr ruthenates. Three t(2g) energy bands and the corresponding Fermi surface sheets are observed, which are also present in the Ca-free Sr2RuO4. We find that while the Fermi surface topology of the alpha,beta (d(yz,zx)) sheets remains almost the same in these two materials, the gamma (d(xy)) sheet exhibits a holelike Fermi surface in Ca1.5Sr0.5RuO4 in contrast to being electronlike in Sr2RuO4. Our observation of all three volume conserving Fermi surface sheets clearly demonstrates the absence of orbital-selective Mott transition, which was proposed theoretically to explain the unusual transport and magnetic properties in Ca1.5Sr0.5RuO4.

引用

页码：177007 / 1

页数：4