Anisotropic structure of the order parameter in FeSe0.45Te0.55 revealed by angle-resolved specific heat

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作者：
B. Zeng
G. Mu
H.Q. Luo
T. Xiang
I.I. Mazin
H. Yang
L. Shan
C. Ren
P.C. Dai
H.-H. Wen
机构：
[1] National Laboratory for Superconductivity,National Laboratory of Solid State Microstructures and Department of Physics
[2] Institute of Physics and National Laboratory for Condensed Matter Physics,Department of Physics and Astronomy
[3] Chinese Academy of Sciences,Neutron Scattering Science Division
[4] Code 6391,undefined
[5] Naval Research Laboratory,undefined
[6] Nanjing University,undefined
[7] The University of Tennessee,undefined
[8] Oak Ridge National Laboratory,undefined
来源：
Nature Communications | / 1卷
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摘要：
The central issues for understanding iron (Fe)-based superconductors are the symmetry and structure of the superconducting gap. So far the experimental data and theoretical models have been highly controversial. Some experiments favor two or more constant or nearly constant gaps, others indicate strong anisotropy and yet others suggest gap zeros ('nodes'). A unique method for addressing this issue, and one of very few methods that are bulk and angle resolved, is measuring the electronic-specific heat in a rotating magnetic field. In this study, we present the first such measurement for an Fe-based high-Tc superconductor. We observed a fourfold oscillation of the specific heat as a function of the in-plane magnetic field direction. Our results are consistent with the expectations for an extended s-wave model, with a significant gap anisotropy on the electron pockets and the gap minima along the ΓM (Fe–Fe bond) direction.
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  • [1] Kamihara Y(2008)Iron-based layered superconductor: La[O J. Am. Chem. Soc. 130 3296-3297
  • [2] Mazin II(2008)F Phys. Rev. Lett. 101 057003-186
  • [3] Singh DJ(2008)]FeAs (x=0.05−0.12) with T Phys. Rev. Lett. 101 087004-037405
  • [4] Johannes MD(2009)=26 K Phys. Rev. Lett. 102 047005-1771
  • [5] Du MH(2010)Unconventional sign-reversing superconductivity in LaFeAsO Nature 464 183-094712
  • [6] Kuroki K(2009)F Phys. Rev. Lett. 102 147002-undefined
  • [7] Wang F(2008)Unconventional superconductivity originating from disconnected Fermi surfaces in LaO EPL 83 47001-undefined
  • [8] Mazin II(2008)F Phys. Rev. Lett. 101 147003-undefined
  • [9] Zhang XH(2009)FeAs J. Phys. Soc. Jpn. 78 013708-undefined
  • [10] Ding H(2010)Functional renormalization-group study of the pairing symmetry and pairing mechanism of the FeAs-based high-temperature superconductor Chin. Phys. Lett. 27 037402-undefined
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