Effect of Cleaving Temperature on the Surface and Bulk Fermi Surface of Sr2RuO4 Investigated by High Resolution Angle-Resolved Photoemission

被引：2

作者：

Liu Shan-Yu ^{[1
,2
]}

Zhang Wen-Tao ^{[1
,2
]}

Weng Hong-Ming ^{[1
,2
]}

Zhao Lin ^{[1
,2
]}

Liu Hai-Yun ^{[1
,2
]}

Jia Xiao-Wen ^{[1
,2
]}

Liu Guo-Dong ^{[1
,2
]}

Dong Xiao-Li ^{[1
,2
]}

Zhang Jun ^{[1
,2
]}

Mao Zhi-Qiang ^{[3
]}

Chen Chuang-Tian ^{[4
]}

Xu Zu-Yan ^{[4
]}

Dai Xi ^{[1
,2
]}

Fang Zhong ^{[1
,2
]}

Zhou Xing-Jiang ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Nat Lab Superconduct, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

[3] Tulane Univ, Dept Phys & Engn Phys, New Orleans, LA 70118 USA

[4] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2012年 / 29卷 / 06期

基金：

中国国家自然科学基金;

关键词：

LAYERED SUPERCONDUCTOR SR2RUO4; VAN-HOVE SINGULARITY; TRIPLET; FERROMAGNETISM; PEROVSKITE;

D O I：

10.1088/0256-307X/29/6/067401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High resolution angle-resolved photoemission measurements are carried out to systematically investigate the effect of cleaving temperature on the electronic structures and Fermi surfaces of Sr2RuO4. Unlike previous reports, which found that a high cleaving temperature can suppress the surface Fermi surface, we find that the surface Fermi surface remains obvious and strong in Sr2RuO4 cleaved at high temperature, even at room temperature. This indicates that cleaving temperature is not a key effective factor in suppressing surface bands. On the other hand, the bulk bands can be enhanced in an aged surface of Sr2RuO4 that has been cleaved and held for a long time. We have also carried out laser ARPES measurements on Sr2RuO4 by using a vacuum ultra-violet laser (photon energy at 6.994 eV) and found an obvious enhancement of bulk bands even for samples cleaved at low temperature. This information is important for realizing an effective approach to manipulating and detecting the surface and bulk electronic structure of Sr2RuO4. In particular, the enhancement of bulk sensitivity, along with the super-high instrumental resolution of VUV laser ARPES, will be advantageous in investigating fine electronic structure and superconducting properties of Sr2RuO4 in the future.

引用

页数：4