Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As1-xPx)2

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作者：
T. Yoshida
S. Ideta
T. Shimojima
W. Malaeb
K. Shinada
H. Suzuki
I. Nishi
A. Fujimori
K. Ishizaka
S. Shin
Y. Nakashima
H. Anzai
M. Arita
A. Ino
H. Namatame
M. Taniguchi
H. Kumigashira
K. Ono
S. Kasahara
T. Shibauchi
T. Terashima
Y. Matsuda
M. Nakajima
S. Uchida
Y. Tomioka
T. Ito
K. Kihou
C. H. Lee
A. Iyo
H. Eisaki
H. Ikeda
R. Arita
T. Saito
S. Onari
H. Kontani
机构：
[1] University of Tokyo,Department of Physics
[2] JST,Department of Applied Physics
[3] Transformative Research-Project on Iron Pnictides (TRIP),Department of Physics
[4] University of Tokyo,Department of Physics
[5] Institute of Solid State Physics,Department of Applied Physics
[6] University of Tokyo,Graduate School of Human and Environmental Studies
[7] Graduate School of Science,Department of Advanced Materials Science
[8] Hiroshima University,undefined
[9] Hiroshima Synchrotron Radiation Center,undefined
[10] Hiroshima University,undefined
[11] KEK,undefined
[12] Photon Factory,undefined
[13] Research Center for Low Temperature and Materials Sciences,undefined
[14] Kyoto University,undefined
[15] Kyoto University,undefined
[16] National Institute of Advanced Industrial Science and Technology (AIST),undefined
[17] Nagoya University,undefined
[18] Nagoya University,undefined
[19] Kyoto University,undefined
[20] University of Tokyo,undefined
来源：
Scientific Reports | / 4卷
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摘要：
We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe2(As1-xPx)2 (x = 0.30, Tc = 30 K). Strongly anisotropic gap has been found only in the electron Fermi surface while the gap on the entire hole Fermi surfaces are nearly isotropic. These results are inconsistent with horizontal nodes but are consistent with modified s± gap with nodal loops. We have shown that the complicated gap modulation can be theoretically reproduced by considering both spin and orbital fluctuations.
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