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Title: Band-dependent superconducting gap in SrFe 2(As 0.65P 0.35) 2 studied by angle-resolved photoemission spectroscopy

Abstract

The isovalent-substituted iron pnictide compound SrFe 2(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 SrFe 2(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, 2 π) – ( π, π, 2 π)] direction.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [4];  [5]; ORCiD logo [1];  [1];  [6];  [6]; ORCiD logo [7];  [8]; ORCiD logo [8]; ORCiD logo [8];  [3];  [5]
  1. Univ. of Tokyo (Japan). Dept. of Physics
  2. Osaka Univ. (Japan). Dept. of Physics
  3. Osaka Univ. (Japan). Dept. of Physics; JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan)
  4. Univ. of Tokyo (Japan). Dept. of Physics; Univ. of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
  5. Univ. of Tokyo (Japan). Dept. of Physics; JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan)
  6. Univ. of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
  7. JST, Transformative Research-Project on Iron Pnictides (TRIP), Tokyo (Japan); Univ. of Tokyo, Chiba (Japan). Inst. for Solid State Physics (ISSP)
  8. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); 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:
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. 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., and Fujimori, A. Mon . "Band-dependent superconducting gap in SrFe2(As0.65P0.35)2 studied by angle-resolved photoemission spectroscopy". United States. doi: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 = {2019},
month = {11}
}

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Works referenced in this record:

Exotic d -Wave Superconducting State of Strongly Hole-Doped K x Ba 1 x Fe 2 As 2
journal, September 2011


The case for dx2 − y2 pairing in the cuprate superconductors
journal, January 1995


Pairing Mechanism in Fe-Based Superconductors
journal, March 2012


Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping in BaFe 2 ( As 1 x P x ) 2 superconductors
journal, May 2010


Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 x F x
journal, July 2008


Possible Three-Dimensional Nodes in the s ± Superconducting Gap of BaFe 2 (As 1- x P x ) 2
journal, January 2011

  • Suzuki, Katsuhiro; Usui, Hidetomo; Kuroki, Kazuhiko
  • Journal of the Physical Society of Japan, Vol. 80, Issue 1
  • DOI: 10.1143/JPSJ.80.013710

Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe2(As,P)2 with low energy photons
journal, April 2012


Orbital-Independent Superconducting Gaps in Iron Pnictides
journal, April 2011


Nodal gap structure of superconducting BaFe 2 (As 1 x P x ) 2 from angle-resolved thermal conductivity in a magnetic field
journal, August 2011


Nodal superconducting-gap structure in ferropnictide superconductor BaFe2(As0.7P0.3)2
journal, March 2012

  • Zhang, Y.; Ye, Z. R.; Ge, Q. Q.
  • Nature Physics, Vol. 8, Issue 5
  • DOI: 10.1038/nphys2248

Electronic Phase Diagram of SrFe 2 (As 1− x P x ) 2 : Effect of Structural Dimensionality
journal, October 2014

  • Kobayashi, Tatsuya; Miyasaka, Shigeki; Tajima, Setsuko
  • Journal of the Physical Society of Japan, Vol. 83, Issue 10
  • DOI: 10.7566/JPSJ.83.104702

P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe 2 ( As 0.67 P 0.33 ) 2
journal, January 2010


Anisotropy of the superconducting gap in the iron-based superconductor BaFe2(As1-xPx)2
journal, December 2014

  • Yoshida, T.; Ideta, S.; Shimojima, T.
  • Scientific Reports, Vol. 4, Issue 1
  • DOI: 10.1038/srep07292

Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K
journal, March 2008

  • Kamihara, Yoichi; Watanabe, Takumi; Hirano, Masahiro
  • Journal of the American Chemical Society, Vol. 130, Issue 11
  • DOI: 10.1021/ja800073m

Pnictogen height as a possible switch between high- T c nodeless and low- T c nodal pairings in the iron-based superconductors
journal, June 2009


Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 x F x
journal, August 2008


Self-consistent Vertex Correction Analysis for Iron-based Superconductors: Mechanism of Coulomb Interaction-Driven Orbital Fluctuations
journal, September 2012


s + i s state with broken time-reversal symmetry in Fe-based superconductors
journal, April 2013


Change of electronic state and crystal structure by postannealing in superconducting SrFe 2 ( As 0 . 65 P 0 . 35 ) 2
journal, May 2013


Vertical loop nodes in iron-based superconductors
journal, October 2012


Phenomenology of the low-energy spectral function in high- T c superconductors
journal, May 1998


Disorder-induced topological change of the superconducting gap structure in iron pnictides
journal, November 2014

  • Mizukami, Y.; Konczykowski, M.; Kawamoto, Y.
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms6657

Nodal gap structure in Fe-based superconductors due to the competition between orbital and spin fluctuations
journal, July 2013


Gap symmetry and structure of Fe-based superconductors
journal, October 2011


A common thread: The pairing interaction for unconventional superconductors
journal, October 2012


Orbital-Fluctuation-Mediated Superconductivity in Iron Pnictides: Analysis of the Five-Orbital Hubbard-Holstein Model
journal, April 2010