Thermopower in quantum confined La-doped SrTiO3 epitaxial heterostructures

被引：6

作者：

Kerman, K. ^{[1
]}

Ramanathan, S. ^{[1
]}

Baniecki, J. D. ^{[2
]}

Ishii, M. ^{[2
]}

Kotaka, Y. ^{[2
]}

Aso, H. ^{[2
]}

Kurihara, K. ^{[2
]}

Schafranek, R. ^{[3
]}

Vailionis, A. ^{[4
]}

机构：

[1] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[2] Fujitsu Ltd, Environm & Energy Mat Labs, Atsugi, Kanagawa, Japan

[3] Univ Bordeaux, IMS, UMR 5218, F-33400 Talence, France

[4] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

来源：

APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 17期

关键词：

FILMS;

D O I：

10.1063/1.4826098

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We characterize effects of dimensionality reduction and electron confinement on thermopower in La-doped SrTiO3 (LSTO) thin films using hetero-epitaxial capping layers with known conduction band offsets. Hall measurements on SrZrO3/LSTO/(La0.3Sr0.7)(Al0.65Ta0.35)O-3 quantum well structures indicate carriers are homogeneously confined in the LSTO film, leading to an unambiguous well width. We do not observe a substantial enhancement of the Seebeck coefficient (S) for confinement widths as thin as 8 angstrom. Recent work towards elucidating the role of thickness scaling on S in complex oxides and implications of our results for using 2D electron confinement to develop advanced thermoelectric materials are discussed. (C) 2013 AIP Publishing LLC.

引用

页数：5

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