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Title: 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

Abstract

Here we have investigated the superconducting (SC) gap on hole Fermi surfaces (FSs) of optimally substituted Ba (Fe 0.65 Ru 0.35) 2 As 2 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.

Authors:
 [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [4];  [4];  [4];  [5];  [5];  [6];  [6];  [7];  [7];  [6];  [6];  [1] more »;  [1];  [8];  [8];  [1];  [1] « less
  1. Univ. of Tokyo (Japan). Dept. of Physics
  2. Univ. of Tokyo (Japan). Dept. of Physics; Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics (ISSP)
  3. Kyoto Univ. (Japan). Graduate School of Human and Environmental Studies
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  5. Univ. of Tokyo, Kashiwa (Japan). Inst. for Solid State Physics (ISSP)
  6. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Electronics and Photonics Research Inst.
  7. National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Research Inst. for Energy Conservation
  8. Nagoya Univ. (Japan). Dept. of Physics
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1353209
Grant/Contract Number:
JP15H02109; JP25220707; JP26610095; AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconductivity; Superconducting gap; Pairing mechanisms

Citation Formats

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., and Fujimori, A. Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(Fe0.65Ru0.35)2As2 : Effects of spin-orbit coupling. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.104504.
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. Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(Fe0.65Ru0.35)2As2 : Effects of spin-orbit coupling. United States. doi:10.1103/PhysRevB.95.104504.
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., and Fujimori, A. Mon . "Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(Fe0.65Ru0.35)2As2 : Effects of spin-orbit coupling". United States. doi:10.1103/PhysRevB.95.104504. https://www.osti.gov/servlets/purl/1353209.
@article{osti_1353209,
title = {Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(Fe0.65Ru0.35)2As2 : Effects of spin-orbit coupling},
author = {Liu, L. and Okazaki, K. and Yoshida, T. and Suzuki, H. and Horio, M. and Ambolode, L. C. C. and Xu, J. and Ideta, S. and Hashimoto, M. and Lu, D. H. and Shen, Z. -X. and Ota, Y. and Shin, S. and Nakajima, M. and Ishida, S. and Kihou, K. and Lee, C. H. and Iyo, A. and Eisaki, H. and Mikami, T. and Kakeshita, T. and Yamakawa, Y. and Kontani, H. and Uchida, S. and Fujimori, A.},
abstractNote = {Here we have investigated the superconducting (SC) gap on hole Fermi surfaces (FSs) of optimally substituted Ba (Fe0.65 Ru0.35)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 kx - ky plane, the gap magnitudes of two resolved hole FSs show similar kz dependences and decrease as kz 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 dz₂ 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.},
doi = {10.1103/PhysRevB.95.104504},
journal = {Physical Review B},
number = 10,
volume = 95,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2017},
month = {Mon Mar 06 00:00:00 EST 2017}
}

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