Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy
Abstract
The isovalent-substituted iron pnictide compound SrFe2(As1–xPx)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(As0.65P0.35)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 kz-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.
- Authors:
-
[1];
[4];
[1];
[7];
[8];
[8];
- 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)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS)
- OSTI Identifier:
- 1595720
- Grant/Contract Number:
- AC02-76SF00515; JP19K03741; JP19H00651; JP19H01818; JP19H05826
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electronic properties and materials; Superconducting properties and materials
Citation Formats
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., and Fujimori, A. Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy. United States: N. p., 2019.
Web. doi:10.1038/s41598-019-52887-y.
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. Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy. United States. https://doi.org/10.1038/s41598-019-52887-y
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., and Fujimori, A. Mon .
"Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy". United States. https://doi.org/10.1038/s41598-019-52887-y. https://www.osti.gov/servlets/purl/1595720.
@article{osti_1595720,
title = {Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy},
author = {Suzuki, H. and Kobayashi, T. and Miyasaka, S. and Okazaki, K. and Yoshida, T. and Horio, M. and Ambolode, II, L. C. C. and Ota, Y. and Yamamoto, H. and Shin, S. and Hashimoto, M. and Lu, D. H. and Shen, Z.-X. and Tajima, S. and Fujimori, A.},
abstractNote = {The isovalent-substituted iron pnictide compound SrFe2(As1–xPx)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(As0.65P0.35)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 kz-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.},
doi = {10.1038/s41598-019-52887-y},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United States},
year = {Mon Nov 11 00:00:00 EST 2019},
month = {Mon Nov 11 00:00:00 EST 2019}
}
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