Transition from Sign-Reversed to Sign-Preserved Cooper-Pairing Symmetry in Sulfur-Doped Iron Selenide Superconductors

Wang, Qisi; Park, J. T.; Feng, Yu; Shen, Yao; Hao, Yiqing; Pan, Bingying; Lynn, J. W.; Ivanov, A.; Chi, Songxue; Matsuda, M.; Cao, Huibo; Birgeneau, R. J.; Efremov, D. V.; Zhao, Jun

doi:10.1103/PhysRevLett.116.197004

Title: Transition from Sign-Reversed to Sign-Preserved Cooper-Pairing Symmetry in Sulfur-Doped Iron Selenide Superconductors

Journal Article · Fri May 13 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.116.197004· OSTI ID:1466695

Wang, Qisi ^[1]; Park, J. T. ^[2]; Feng, Yu ^[1]; Shen, Yao ^[1]; Hao, Yiqing ^[1]; Pan, Bingying ^[1]; Lynn, J. W. ^[3]; Ivanov, A. ^[4]; Chi, Songxue ^[5]; Matsuda, M. ^[5]; Cao, Huibo ^[5]; Birgeneau, R. J. ^[6]; Efremov, D. V. ^[7]; Zhao, Jun ^[1]

Fudan Univ., Shanghai (China)
Technishe Univ. Munchen, Garching (Germany)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Institut Laue-Langevin, Grenoble Cedex (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of California, Berkeley, CA (United States)
IFW Dresden, Dresden (Germany)

Here, an essential step toward elucidating the mechanism of superconductivity is to determine the sign or phase of the superconducting order parameter, as it is closely related to the pairing interaction. In conventional superconductors, the electron-phonon interaction induces attraction between electrons near the Fermi energy and results in a sign-preserved s-wave pairing. For high-temperature superconductors, including cuprates and iron-based superconductors, prevalent weak coupling theories suggest that the electron pairing is mediated by spin fluctuations which lead to repulsive interactions, and therefore that a sign-reversed pairing with an s± or d-wave symmetry is favored. Here, by using magnetic neutron scattering, a phase sensitive probe of the superconducting gap, we report the observation of a transition from the sign-reversed to sign-preserved Cooper-pairing symmetry with insignificant changes in T_c in the S-doped iron selenide superconductors K_xFe_2-y(Se_1-zS_z)₂. We show that a rather sharp magnetic resonant mode well below the superconducting gap (2Δ) in the undoped sample (z=0) is replaced by a broad hump structure above 2Δ under 50% S doping. These results cannot be readily explained by simple spin fluctuation-exchange pairing theories and, therefore, multiple pairing channels are required to describe superconductivity in this system. Our findings may also yield a simple explanation for the sometimes contradictory data on the sign of the superconducting order parameter in iron-based materials.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; AC03-76SF008

OSTI ID:: 1466695

Alternate ID(s):: OSTI ID: 1253071

Journal Information:: Physical Review Letters, Vol. 116, Issue 19; Related Information: © 2016 American Physical Society.; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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