title: Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As(1-x)P(x))2.
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.
authors.affiliation: 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ideta
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shimojima
authors.affiliation: Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
authors.forename: W
authors.initials: W
authors.lastname: Malaeb
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Shinada
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Nishi
authors.affiliation: 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Fujimori
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ishizaka
authors.affiliation: Institute of Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Shin
authors.affiliation: Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nakashima
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Anzai
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Arita
authors.affiliation: Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Ino
authors.affiliation: Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Namatame
authors.affiliation: 1] Graduate School of Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan [2] Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Taniguchi
authors.affiliation: KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kumigashira
authors.affiliation: KEK, Photon Factory, Tsukuba, Ibaraki 305-0801, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Ono
authors.affiliation: 1] Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan [2] Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kasahara
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Shibauchi
authors.affiliation: Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Terashima
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Matsuda
authors.affiliation: Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nakajima
authors.affiliation: 1] Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan [2] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Uchida
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tomioka
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ito
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kihou
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
authors.forename: C H
authors.initials: CH
authors.lastname: Lee
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Iyo
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Eisaki
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ikeda
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Arita
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Saito
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Applied Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Onari
authors.affiliation: 1] JST, Transformative Research-Project on Iron Pnictides (TRIP), Chiyoda, Tokyo 102-0075, Japan [2] Department of Physics, Nagoya University, Furo-cho, Nagoya 464-8602, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kontani