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

K. Ahilan; J. Balasubramaniam; F. L. Ning; T. Imai; A. S. Sefat; R. Jin; M. A. McGuire; B. C. Sales; D. Mandrus

doi:10.1088/0953-8984/20/47/472201

Pressure effects on the electron-doped high T_c superconductor BaFe_2-xCo_xAs₂

K. Ahilan, J. Balasubramaniam, F. L. Ning, T. Imai, A. S. Sefat, R. Jin, M. A. McGuire, B. C. Sales, D. Mandrus

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55 Scopus citations

Abstract

Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe₂As₂ into a superconductor with T_c exceeding 20 K. We carried out systematic transport measurements of BaFe_2-xCo_xAs 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 T_c 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 T_c = 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.

Original language	English
Article number	472201
Journal	Journal of Physics Condensed Matter
Volume	20
Issue number	47
DOIs	https://doi.org/10.1088/0953-8984/20/47/472201
State	Published - Nov 6 2008
Externally published	Yes

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title = "Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2",

abstract = "Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe2As2 into a superconductor with Tc exceeding 20 K. We carried out systematic transport measurements of BaFe2-xCoxAs 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.",

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T1 - Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2

AU - Ahilan, K.

AU - Balasubramaniam, J.

AU - Ning, F. L.

AU - Imai, T.

AU - Sefat, A. S.

AU - Jin, R.

AU - McGuire, M. A.

AU - Sales, B. C.

AU - Mandrus, D.

PY - 2008/11/6

Y1 - 2008/11/6

N2 - Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe2As2 into a superconductor with Tc exceeding 20 K. We carried out systematic transport measurements of BaFe2-xCoxAs 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.

AB - Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe2As2 into a superconductor with Tc exceeding 20 K. We carried out systematic transport measurements of BaFe2-xCoxAs 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.

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ER -

Pressure effects on the electron-doped high T_c superconductor BaFe_2-xCo_xAs₂

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