Pulsed-laser deposition of superconducting LiTi2O4 ultrathin films

被引：10

作者：

Oshima, Takayoshi ^{[1
]}

Yokoyama, Kosuke ^{[1
]}

Niwa, Mifuyu ^{[1
]}

Ohtomo, Akira ^{[1
,2
]}

机构：

[1] Tokyo Inst Technol, Dept Appl Chem, Meguro Ku, Tokyo 1528552, Japan

[2] Tokyo Inst Technol, Mat Res Ctr Element Strategy MCES, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

JOURNAL OF CRYSTAL GROWTH | 2015年 / 419卷

基金：

日本学术振兴会;

关键词：

X-ray diffraction; Pulsed-laser deposition; Lithium compounds; Oxide superconducting materials; NEGATIVE ELECTRODE; THIN-FILMS; LI; TEMPERATURE;

D O I：

10.1016/j.jcrysgro.2015.03.029

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

We report epitaxial growth, structural characterizations arid thickness dependent superconducting properties of LiTi2O4 films grown on (111) MgAl2O4 substrates by using pulsed laser deposition. The variations of growth temperature (T-g) and excess Li composition of target materials were found to be crucial for improving the crystallinity, as verified by X-ray diffraction rocking curve and the in-plane domain configuration. The crystallinity of the desired LiTi2O4 phase improved with increasing T-g, whereas the inclusion of Li-deficient phases became more significant due to high sublimation rate of Li species. The use of the excess Li targets allowed us to elevate T-g up to 750 degrees C (Li/Ti=1.0) with keeping high crystallinity and phase purity. For films grown under the best condition, the superconducting transition was observed near 12 K even when thickness was as thin as 9 nm. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：153 / 157

页数：5

共 22 条

[1] CORRELATION BETWEEN OPTICAL-PROPERTIES, COMPOSITION, AND DEPOSITION PARAMETERS IN PULSED-LASER DEPOSITED LINBO3 FILMS [J].