In situ photoemission characterization of the tunneling barrier in La0.6Sr0.4MnO3SrTiO3/La0.6Sr0.4MnO3 tunneling junctions

被引：0

作者：

Kumigashira, H.

Hashimoto, R.

Chikamatsu, A.

Oshima, M.

Wadati, H.

Fujimori, A.

Lippmaa, M.

Kawasaki, M.

Koinuma, H.

机构：

[1] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[2] Univ Tokyo, Dept Complex Sci & Engn, Kashiwa, Chiba 2778561, Japan

[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[5] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 310卷 / 02期

基金：

日本学术振兴会;

关键词：

magnetic tunneling junction; manganite; laser MBE;

D O I：

10.1016/j.jmmm.2006.10.690

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed Ti 2p core-level photoemission and X-ray absorption spectroscopic (XAS) studies on the insulating barrier SrTiO3 (STO) layer sandwiched by La0.6Sr0.4MnO3 (LSMO) layers. The elemental selectivity of the techniques enabled us to extract the electronic structure of the constituent layers in the vicinity of the heterointerfaces. The Ti 2p core-level and XAS spectra clearly showed Ti4+ states and did not exhibit any indication of Ti3+ states. This result indicates that the Ti ions in the TiO2 atomic layers preserve their tetravalent states even in the vicinity of the valence-mismatched interface between LSMO and STO, reflecting the chemical stability of the Ti4+ states. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：1997 / 1999

页数：3

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