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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 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.

Authors:
 [1];  [2];  [1];  [1];  [3];  [3];  [3];  [3];  [3]
  1. McMaster University
  2. Canadian Institute for Advanced Research
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
965870
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Physics: Condensed Matter
Additional Journal Information:
Journal Volume: 20; Journal Issue: 47
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRONS; DOPED MATERIALS; COBALT ARSENIDES; BARIUM COMPOUNDS; ARSENIDES; IRON ARSENIDES; PRESSURE DEPENDENCE; SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; TRANSITION TEMPERATURE

Citation Formats

Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Safa-Sefat, Athena, Jin, Rongying, McGuire, Michael A, Sales, Brian C, and Mandrus, David. Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2. United States: N. p., 2008. Web. doi:10.1088/0953-8984/20/47/472201.
Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Safa-Sefat, Athena, Jin, Rongying, McGuire, Michael A, Sales, Brian C, & Mandrus, David. Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2. United States. https://doi.org/10.1088/0953-8984/20/47/472201
Ahilan, K., Balasubramaniam, J., Ning, F. L., Imai, T., Safa-Sefat, Athena, Jin, Rongying, McGuire, Michael A, Sales, Brian C, and Mandrus, David. Tue . "Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2". United States. https://doi.org/10.1088/0953-8984/20/47/472201.
@article{osti_965870,
title = {Pressure effects on the electron-doped high Tc superconductor BaFe2-xCoxAs2},
author = {Ahilan, K. and Balasubramaniam, J. and Ning, F. L. and Imai, T. and Safa-Sefat, Athena and Jin, Rongying and McGuire, Michael A and Sales, Brian C and Mandrus, David},
abstractNote = {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.},
doi = {10.1088/0953-8984/20/47/472201},
url = {https://www.osti.gov/biblio/965870}, journal = {Journal of Physics: Condensed Matter},
number = 47,
volume = 20,
place = {United States},
year = {2008},
month = {1}
}