Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As1-xPx)2
Scientific Reports2014Vol. 4(1), pp. 7292–7292
Citations Over TimeTop 21% of 2014 papers
T. Yoshida, S. Ideta, T. Shimojima, Walid Malaeb, K. Shinada, H. Suzuki, I. Nishi, A. Fujimori, K. Ishizaka, Shik Shin, Y. Nakashima, H. Anzai, Masashi Arita, A. Ino, H. Namatame, M. Taniguchi, Hiroshi Kumigashira, Kanta Ono, S. Kasahara, T. Shibauchi, Takahito Terashima, Yuji Matsuda, M. Nakajima, S. Uchida, Y. Tomioka, T. Ito, Kunihiro Kihou, Chul‐Ho Lee, Akira Iyo, Hiroshi Eisaki, Hiroaki Ikeda, Ryotaro Arita, Tetsuro Saito, Seiichiro Onari, Hiroshi Kontani
Abstract
We report peculiar momentum-dependent anisotropy in the superconducting gap observed by angle-resolved photoemission spectroscopy in BaFe2(As(1-x)P(x))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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