Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy

Suzuki, H.; Kobayashi, T.; Miyasaka, S.; Okazaki, K.; Yoshida, T.; Horio, M.; Ambolode, II, L. C.  C.; Ota, Y.; Yamamoto, H.; Shin, S.; Hashimoto, M.; Lu, D. H.; Shen, Z.-X.; Tajima, S.; Fujimori, A.

doi:10.1038/s41598-019-52887-y

Title: Band-dependent superconducting gap in SrFe₂(As_0.65P_0.35)₂ studied by angle-resolved photoemission spectroscopy

Journal Article · 11 November 2019 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-019-52887-y · OSTI ID:1595720

^[1]; Kobayashi, T. ^[2]; Miyasaka, S. ^[3];

^[4]; Yoshida, T. ^[5];

^[1]; Ambolode, II, L. C. C. ^[1]; Ota, Y. ^[6]; Yamamoto, H. ^[6];

^[7]; Hashimoto, M. ^[8];

^[8];

^[8]; Tajima, S. ^[3]; Fujimori, A. ^[5]

Univ. of Tokyo (Japan). Dept. of Physics
Osaka Univ. (Japan). Dept. of Physics
Osaka Univ. (Japan). Dept. of Physics; JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan)
Univ. of Tokyo (Japan). Dept. of Physics; Univ. of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
Univ. of Tokyo (Japan). Dept. of Physics; JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan)
Univ. of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan); Univ. of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

The isovalent-substituted iron pnictide compound SrFe₂(As_1–xP_x)₂ exhibits multiple evidence for nodal superconductivity via various experimental probes, such as the penetration depth, nuclear magnetic resonance and specific heat measurements. The direct identification of the nodal superconducting (SC) gap structure is challenging, partly because the presence of nodes is not protected by symmetry but instead caused by an accidental sign change of the order parameter, and also because of the three-dimensionality of the electronic structure. We have studied the SC gaps of SrFe₂(As_0.65P_0.35)₂ in three-dimensional momentum space by synchrotron and laser-based angle-resolved photoemission spectroscopy. The three hole Fermi surfaces (FSs) at the zone center have SC gaps with different magnitudes, whereas the SC gaps of the electron FSs at the zone corner are almost isotropic and k_z-independent. As a possible nodal SC gap structure, we propose that the SC gap of the outer hole FS changes sign around the Z-X [(0, 0, 2π) – (π, π, 2π)] direction.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: AC02-76SF00515; JP19K03741; JP19H00651; JP19H01818; JP19H05826

OSTI ID:: 1595720

Journal Information:: Scientific Reports, Vol. 9, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Band-dependent superconducting gap in SrFe₂(As_0.65P_0.35)₂ studied by angle-resolved photoemission spectroscopy