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

Abstract

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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References in corpus (10)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Pressure induced superconductivity in CaFe${}_2$As${}_2$
• Superconductivity in Co-doped LaFeAsO
• Electron Correlations in the Low Carrier Density LaFeAsO0.89F0.11 Superconductor (Tc = 28 K)
• Pressure-induced superconductivity in single crystal CaFe2As2
• 59-Co and 75-As NMR Investigation of Electron-Doped High Tc Superconductor BaFe(1.8)Co(0.2)As(2) (Tc = 22K)
• Suppression of Magnetic Order by Pressure in BaFe2As2
• Effect of pressure on the superconducting critical temperature of La[O_{0.89}F_{0.11}]FeAs and Ce[O_{0.88}F_{0.12}]FeAs

Cited by in corpus (23)

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• Specific heat jump at the superconducting transition temperature in Ba(Fe(1-x)Cox)2As2 and Ba(Fe(1-x)Nix)2As2 single crystals
• Strong Tc dependence for strained, epitaxial Ba(Fe1-xCox)2As2 thin films
• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictides
• High Pressure Studies on Fe-Pnictide Superconductors
• Pressure induced superconductivity in BaFe2As2 single crystal
• The Electronic Phase Diagram of the Iron-based High Tc Superconductor Ba(Fe(1-x)Co(x))2As2 Under Hydrostatic Pressure (0 < x <0.099)
• 59Co and 75As NMR Investigation of the Lightly Doped Ba[Fe(1-x)Co(x)]2As2 (x =0.02, 0.04)
• Specific Heat Discontinuity, deltaC, at Tc in BaFe2(As0.7P0.3)2 - Consistent with Unconventional Superconductivity
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• Possible unconventional superconductivity in substituted BaFe${}_2$As${}_2$ revealed by magnetic pair-breaking studies
• Evidence for Coexistence of Superconductivity and Magnetism in Single Crystals of Co-doped SrFe${}_2$As${}_2$
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• A Finite-temperature First-principles Approach to Spin Fluctuation in BaFe_2As_2
• Suppression of ferromagnetism governed by a critical lattice parameter in CeTiGe$\_3$ with hydrostatic pressure or V substitution
• Optical Study of BaFe${}_2$As${}_2$ under pressure: Coexistence of spin-density-wave gap and superconductivity
• Resistivity in Co-doped Ba-122: comparison of thin films and single crystals
• High-Pressure Evolution of the Specific Heat of a Strongly Underdoped Ba(Fe0.963Co0.037)As2 Iron-Based Superconductor
• Pressure tuned superconductivity and normal state behavior in Ba(Fe${}_{0.943}$Co${}_{0.057}$)${}_2$As${}_2$ near the antiferromagnetic boundary
• Superconductivity Near a Quantum Critical Point in Ba(Fe,Co)2As2
• Effect of Co doping and hydrostatic pressure on SrFe2As2