Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2

被引：52

作者：

Ahilan, K. ^{[1
]}

Balasubramaniam, J. ^{[1
]}

Ning, F. L. ^{[1
]}

Imai, T. ^{[1
,2
]}

Sefat, A. S. ^{[3
]}

Jin, R. ^{[3
]}

McGguire, M. A. ^{[3
]}

Sales, B. C. ^{[3
]}

Mandrus, D. ^{[3
]}

机构：

[1] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

[3] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2008年 / 20卷 / 47期

关键词：

Iron-based Superconductors - Semiconductor doping - Arsenic compounds - Pressure effects - Barium compounds - Technetium;

D O I：

10.1088/0953-8984/20/47/472201

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe(2)As(2) into a superconductor with T(c) exceeding 20 K. We carried out systematic transport measurements of BaFe(2-x)Co(x)As(2) superconductors in pressures up to 2.5 GPa, and elucidated the interplay between the effects of electron doping and pressure. For the underdoped sample with nominal composition x = 0.08, application of pressure strongly suppresses a magnetic instability while enhancing Tc by nearly a factor of two from 11 to 21 K. In contrast, the optimally doped x = 0.20 sample shows very little enhancement of Tc = 22 K under applied pressure. Our results strongly suggest that the proximity to a magnetic instability is the key to the mechanism of superconductivity in iron-pnictides.

引用

页数：5

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