Pressure effects on the electron-doped high Tc superconductor BaFe(2-x)Co(x)As(2)

Details Pressure effects on the electron-doped high Tc superconductor BaFe(2-x)Co(x)As(2) Pressure effects on the electron-doped high Tc superconductor BaFe(2-x)Co(x)As(2)

2008-10-01

arxiv.org/abs/0810.0287v1

J. Phys.: Condens. Matter 20 (2008) 472201. (Fast Track Communications)

Physics

Condensed Matter

Superconductivity

5 figures

Scientific paper

10.1088/0953-8984/20/47/472201

Application of pressures or electron-doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe(2)As(2) into a superconductor with the Tc exceeding 20K. We carried out systematic transport measurements of BaFe(2-x)Co(x)As(2) superconductors in pressures up to 2.5GPa, and elucidate the interplay between the effects of electron-doping and pressures. 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 11K to 21K. In contrast, the optimally doped x=0.20 sample shows very little enhancement of Tc=22K 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.

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