Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2
- McMaster University
- Canadian Institute for Advanced Research
- ORNL
Application of pressure or electron doping through Co substitution into Fe sites transforms the itinerant antiferromagnet BaFe{sub 2}As{sub 2} into a superconductor with T{sub c} exceeding 20 K. We carried out systematic transport measurements of BaFe{sub 2?x}Co{sub x}As{sub 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{sub 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{sub 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 965870
- Journal Information:
- Journal of Physics: Condensed Matter, Vol. 20, Issue 47
- Country of Publication:
- United States
- Language:
- English
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