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

Journal Article · · Journal of Physics: Condensed Matter
 [1];  [2];  [1];  [1];  [3];  [3];  [3];  [3];  [3]
  1. McMaster University
  2. Canadian Institute for Advanced Research
  3. ORNL
+ Show Author Affiliations
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 Laboratory (ORNL)
Sponsoring Organization:
SC USDOE - Office of Science (SC)
DOE Contract Number:
AC05-00OR22725
OSTI ID:
965870
Journal Information:
Journal of Physics: Condensed Matter, Journal Name: Journal of Physics: Condensed Matter Journal Issue: 47 Vol. 20
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
ARSENIDES
BARIUM COMPOUNDS
COBALT ARSENIDES
DOPED MATERIALS
ELECTRONS
HIGH-TC SUPERCONDUCTORS
IRON ARSENIDES
PRESSURE DEPENDENCE
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE