Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(Fe0.65Ru0.35)2As2 : Effects of spin-orbit coupling

Liu, L.; Okazaki, K.; Yoshida, T.; Suzuki, H.; Horio, M.; Ambolode, L. C.  C.; Xu, J.; Ideta, S.; Hashimoto, M.; Lu, D. H.; Shen, Z. -X.; Ota, Y.; Shin, S.; Nakajima, M.; Ishida, S.; Kihou, K.; Lee, C. H.; Iyo, A.; Eisaki, H.; Mikami, T.; Kakeshita, T.; Yamakawa, Y.; Kontani, H.; Uchida, S.; Fujimori, A.

doi:10.1103/PhysRevB.95.104504

Unusual nodal behaviors of the superconducting gap in the iron-based superconductor $Ba (F e_{0.65} R u_{0.35})_{2} A s_{2}$ : Effects of spin-orbit coupling

Journal Article · Sun Mar 05 23:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.104504· OSTI ID:1353209

Liu, L. ^[1]; Okazaki, K. ^[2]; Yoshida, T. ^[3]; Suzuki, H. ^[1]; Horio, M. ^[1]; Ambolode, L. C. C. ^[1]; Xu, J. ^[1]; Ideta, S. ^[1]; Hashimoto, M. ^[4]; Lu, D. H. ^[4]; Shen, Z. -X. ^[4]; Ota, Y. ^[5]; Shin, S. ^[5]; Nakajima, M. ^[6]; Ishida, S. ^[6]; Kihou, K. ^[7]; Lee, C. H. ^[7]; Iyo, A. ^[6]; Eisaki, H. ^[6]; Mikami, T. ^[1] more »

Univ. of Tokyo (Japan). Dept. of Physics
Univ. of Tokyo (Japan). Dept. of Physics; Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics (ISSP)
Kyoto Univ. (Japan). Graduate School of Human and Environmental Studies
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics (ISSP)
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Electronics and Photonics Research Inst.
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Research Inst. for Energy Conservation
Nagoya Univ. (Japan). Dept. of Physics

Here we have investigated the superconducting (SC) gap on hole Fermi surfaces (FSs) of optimally substituted Ba (Fe_0.65 Ru_0.35)₂ As₂ by angle-resolved photoemission spectroscopy (APRES) using bulk-sensitive 7 eV laser and synchrotron radiation. It was found that, whereas the gap is isotropic in the k_x - k_y plane, the gap magnitudes of two resolved hole FSs show similar k_z dependences and decrease as k_z approaches ~ 2 π/c (i.e., around the Z point), unlike the other Fe-based superconductors reported so far, where the SC gap of only one hole FS shows a strong k z dependence. This unique gap structure can be understood in the scenario that the d_z₂ orbital character is mixed into both hole FSs due to finite spin-orbit coupling (SOC) and is reproduced by calculation within the random phase approximation including the SOC.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1353209

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Influence of Spin-Orbit Coupling in Iron-Based Superconductors Day, R. P.; Levy, G.; Michiardi, M. Physical Review Letters, Vol. 121, Issue 7 https://doi.org/10.1103/physrevlett.121.076401	journal	August 2018
Influence of Spin Orbit Coupling in the Iron-Based Superconductors Day, R. P.; Levy, G.; Michiardi, M. arXiv https://doi.org/10.48550/arxiv.1711.06686	text	January 2017

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