Suppression of superconductivity in FeSe films under tensile strain

被引：99

作者：

Nie, Y. F. ^{[1
]}

Brahimi, E. ^{[1
]}

Budnick, J. I. ^{[1
]}

Hines, W. A. ^{[1
]}

Jain, M. ^{[1
]}

Wells, B. O. ^{[1
]}

机构：

[1] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 24期

关键词：

iron compounds; pulsed laser deposition; superconducting thin films; superconducting transition temperature; superconducting transitions; tensile strength; X-ray diffraction; 43; K; IRON; LAO1-XFXFEAS; SYSTEMS;

D O I：

10.1063/1.3155441

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied the effect of tensile strain on the superconductivity in FeSe films. 50, 100, and 200 nm FeSe films were grown on MgO, SrTiO(3), and LaAlO(3) substrates by using a pulsed laser deposition technique. X-ray diffraction analysis showed that the tetragonal phase is dominant in all of our FeSe films. The 50 nm FeSe films on MgO and SrTiO(3) are under tensile strain, while the 50 nm FeSe film on LaAlO(3) and the other thick FeSe films are unstrained. Superconducting transitions have been observed in unstrained FeSe films with T(onset)approximate to 8 K, which is close to the bulk value. However, no sign of superconductivity has been observed in FeSe films under tensile strain down to 5 K. This is evidence to show that tensile strain suppresses superconductivity in FeSe films.

引用

页数：3

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