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Teague ML, Drayna GK, Lockhart GP, et al. Measurement of a sign-changing two-gap superconducting phase in electron-doped Ba(Fe(1-x)Co(x))2As2 single crystals using scanning tunneling spectroscopy. Phys Rev Lett. 2011;106(8):087004doi: 10.1103/PhysRevLett.106.087004.
Teague, M. L., Drayna, G. K., Lockhart, G. P., Cheng, P., Shen, B., Wen, H. H., & Yeh, N. C. (2011). Measurement of a sign-changing two-gap superconducting phase in electron-doped Ba(Fe(1-x)Co(x))2As2 single crystals using scanning tunneling spectroscopy. Physical review letters, 106(8), 087004. https://doi.org/10.1103/PhysRevLett.106.087004
Teague, M L, et al. "Measurement of a sign-changing two-gap superconducting phase in electron-doped Ba(Fe(1-x)Co(x))2As2 single crystals using scanning tunneling spectroscopy." Physical review letters vol. 106,8 (2011): 087004. doi: https://doi.org/10.1103/PhysRevLett.106.087004
Teague ML, Drayna GK, Lockhart GP, Cheng P, Shen B, Wen HH, Yeh NC. Measurement of a sign-changing two-gap superconducting phase in electron-doped Ba(Fe(1-x)Co(x))2As2 single crystals using scanning tunneling spectroscopy. Phys Rev Lett. 2011 Feb 25;106(8):087004. doi: 10.1103/PhysRevLett.106.087004. Epub 2011 Feb 24. PMID: 21405593.
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Phys Rev Lett. 2011 Feb 25;106(8):087004. doi: 10.1103/PhysRevLett.106.087004. Epub 2011 Feb 24.

Measurement of a sign-changing two-gap superconducting phase in electron-doped Ba(Fe(1-x)Co(x))2As2 single crystals using scanning tunneling spectroscopy.

Physical review letters

M L Teague, G K Drayna, G P Lockhart, P Cheng, B Shen, H-H Wen, N-C Yeh

Affiliations

  1. Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.

PMID: 21405593 DOI: 10.1103/PhysRevLett.106.087004

Abstract

Scanning tunneling spectroscopic studies of Ba(Fe(1-x)Co(x))(2)As(2) (x=0.06, 0.12) single crystals reveal direct evidence for predominantly two-gap superconductivity. These gaps decrease with increasing temperature and vanish above the superconducting transition T(c). The two-gap nature and the slightly doping- and energy-dependent quasiparticle scattering interferences near the wave vectors (±π, 0) and (0, ±π) are consistent with sign-changing s-wave superconductivity. The excess zero-bias conductance and the large gap-to-T(c) ratios suggest dominant unitary impurity scattering.

© 2011 American Physical Society

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