Unconventional pairing in the iron arsenide superconductors

Rafael M. Fernandes; Daniel K. Pratt; Wei Tian; Jerel Zarestky; Andreas Kreyssig; Shibabrata Nandi; Min Gyu Kim; Alex Thaler; Ni Ni; Paul C. Canfield; Robert J. McQueeney; Jörg Schmalian; Alan I. Goldman

doi:10.1103/PhysRevB.81.140501

Unconventional pairing in the iron arsenide superconductors

Rafael M. Fernandes, Daniel K. Pratt, Wei Tian, Jerel Zarestky, Andreas Kreyssig, Shibabrata Nandi, Min Gyu Kim, Alex Thaler, Ni Ni, Paul C. Canfield, Robert J. McQueeney, Jörg Schmalian, Alan I. Goldman

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185 Scopus citations

Abstract

We use magnetic long-range order as a tool to probe the Cooper-pair wave function in the iron arsenide superconductors. We show theoretically that antiferromagnetism and superconductivity can coexist in these materials only if Cooper pairs form an unconventional, sign-changing state. The observation of coexistence in Ba (Fe_1-x Co_x)₂ As₂ then demonstrates unconventional pairing in this material. The detailed agreement between theory and neutron-diffraction experiments, in particular, for the unusual behavior of the magnetic order below Tc, demonstrates the robustness of our conclusions. Our findings strongly suggest that superconductivity is unconventional in all members of the iron arsenide family.

Original language	English
Article number	140501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.81.140501
State	Published - Apr 2 2010
Externally published	Yes

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Fernandes, R. M., Pratt, D. K., Tian, W., Zarestky, J., Kreyssig, A., Nandi, S., Kim, M. G., Thaler, A., Ni, N., Canfield, P. C., McQueeney, R. J., Schmalian, J., & Goldman, A. I. (2010). Unconventional pairing in the iron arsenide superconductors. Physical Review B - Condensed Matter and Materials Physics, 81(14), Article 140501. https://doi.org/10.1103/PhysRevB.81.140501

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abstract = "We use magnetic long-range order as a tool to probe the Cooper-pair wave function in the iron arsenide superconductors. We show theoretically that antiferromagnetism and superconductivity can coexist in these materials only if Cooper pairs form an unconventional, sign-changing state. The observation of coexistence in Ba (Fe1-x Cox)2 As2 then demonstrates unconventional pairing in this material. The detailed agreement between theory and neutron-diffraction experiments, in particular, for the unusual behavior of the magnetic order below Tc, demonstrates the robustness of our conclusions. Our findings strongly suggest that superconductivity is unconventional in all members of the iron arsenide family.",

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AU - Fernandes, Rafael M.

AU - Pratt, Daniel K.

AU - Tian, Wei

AU - Zarestky, Jerel

AU - Kreyssig, Andreas

AU - Nandi, Shibabrata

AU - Kim, Min Gyu

AU - Thaler, Alex

AU - Ni, Ni

AU - Canfield, Paul C.

AU - McQueeney, Robert J.

AU - Schmalian, Jörg

AU - Goldman, Alan I.

PY - 2010/4/2

Y1 - 2010/4/2

N2 - We use magnetic long-range order as a tool to probe the Cooper-pair wave function in the iron arsenide superconductors. We show theoretically that antiferromagnetism and superconductivity can coexist in these materials only if Cooper pairs form an unconventional, sign-changing state. The observation of coexistence in Ba (Fe1-x Cox)2 As2 then demonstrates unconventional pairing in this material. The detailed agreement between theory and neutron-diffraction experiments, in particular, for the unusual behavior of the magnetic order below Tc, demonstrates the robustness of our conclusions. Our findings strongly suggest that superconductivity is unconventional in all members of the iron arsenide family.

AB - We use magnetic long-range order as a tool to probe the Cooper-pair wave function in the iron arsenide superconductors. We show theoretically that antiferromagnetism and superconductivity can coexist in these materials only if Cooper pairs form an unconventional, sign-changing state. The observation of coexistence in Ba (Fe1-x Cox)2 As2 then demonstrates unconventional pairing in this material. The detailed agreement between theory and neutron-diffraction experiments, in particular, for the unusual behavior of the magnetic order below Tc, demonstrates the robustness of our conclusions. Our findings strongly suggest that superconductivity is unconventional in all members of the iron arsenide family.

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JO - Physical Review B - Condensed Matter and Materials Physics

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Unconventional pairing in the iron arsenide superconductors

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