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Nature Research, Scientific Reports, 1(4), 2014

DOI: 10.1038/srep07292

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

Journal article published in 2014 by T. Yoshida, S. Ideta, T. Shimojima ORCID, W. Malaeb, K. Shinada, H. Suzuki, I. Nishi, A. Fujimori, K. Ishizaka, S. Shin, Y. Nakashima, H. Anzai, M. Arita, A. Ino, H. Namatame and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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.