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

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. ShibauchiT. 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

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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=30K). 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.

Original languageEnglish
Article number7292
Number of pages6
JournalScientific Reports
Publication statusPublished - Dec 3 2014
Externally publishedYes


ASJC Scopus subject areas

  • General

Cite this

Yoshida, T., Ideta, S., Shimojima, T., Malaeb, W., Shinada, K., Suzuki, H., Nishi, I., Fujimori, A., Ishizaka, K., Shin, S., Nakashima, Y., Anzai, H., Arita, M., Ino, A., Namatame, H., Taniguchi, M., Kumigashira, H., Ono, K., Kasahara, S., ... Kontani, H. (2014). Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As1-xPx)2. Scientific Reports, 4, [7292].