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

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 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.

Authors:

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

Publication Date:: Mon Mar 06 00:00:00 EST 2017

Research Org.:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); 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:: 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.

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                    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.  https://doi.org/10.1103/PhysRevB.95.104504

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                    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.  https://doi.org/10.1103/PhysRevB.95.104504.  https://www.osti.gov/servlets/purl/1353209.

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@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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Works referencing / citing this record:

Influence of Spin Orbit Coupling in the Iron-Based Superconductors
text, January 2017

Day, R. P.; Levy, G.; Michiardi, M.
arXiv
DOI: 10.48550/arxiv.1711.06686

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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

Citation Formats

Significant Reduction of Electronic Correlations upon Isovalent Ru Substitution of BaFe 2 As 2 journal, August 2010

Evidence for excluding the possibility of d -wave superconducting-gap symmetry in Ba-doped KFe 2 As 2 journal, February 2014

Two-Dimensional and Three-Dimensional Fermi Surfaces of Superconducting BaFe 2 ( As 1 − x P x ) 2 and Their Nesting Properties Revealed by Angle-Resolved Photoemission Spectroscopy journal, March 2011

Effects of Ru substitution on electron correlations and Fermi-surface dimensionality in Ba(Fe 1 − x Ru x ) 2 As 2 journal, August 2012

Low-Temperature and High-Energy-Resolution Laser Photoemission Spectroscopy journal, July 2015

Manifestations of multiple-carrier charge transport in the magnetostructurally ordered phase of BaFe 2 As 2 journal, November 2011

Effects of Disordered Ru Substitution in BaFe 2 As 2 : Possible Realization of Superdiffusion in Real Materials journal, January 2013

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

Physical and magnetic properties of Ba ( Fe 1 − x Ru x ) 2 As 2 single crystals journal, July 2010

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

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

What Controls the Phase Diagram and Superconductivity in Ru-Substituted BaFe 2 As 2 ? journal, December 2011

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

Robust Nodal Superconductivity Induced by Isovalent Doping in Ba ( Fe 1 − x Ru x ) 2 As 2 and BaFe 2 ( As 1 − x P x ) 2 journal, February 2012

Hole and electron contributions to the transport properties of Ba ( Fe 1 − x Ru x ) 2 As 2 single crystals journal, June 2010

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

Evolution of transport properties of BaFe 2 − x Ru x As 2 in a wide range of isovalent Ru substitution journal, January 2012

Unprecedented anisotropic metallic state in undoped iron arsenide BaFe2As2 revealed by optical spectroscopy journal, July 2011

Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe 0.75 Ru 0.25 ) 2 As 2 journal, March 2013

Line nodes in the energy gap of superconducting BaFe 2 ( As 1 − x P x ) 2 single crystals as seen via penetration depth and thermal conductivity journal, June 2010

Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2 journal, September 2012

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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

Significant Reduction of Electronic Correlations upon Isovalent Ru Substitution of ${BaFe}_{2} {As}_{2}$
journal, August 2010

Evidence for excluding the possibility of $d$ -wave superconducting-gap symmetry in Ba-doped KFe $_{2}$ As $_{2}$
journal, February 2014

Two-Dimensional and Three-Dimensional Fermi Surfaces of Superconducting ${BaFe}_{2} ({As}_{1 - x} P_{x})_{2}$ and Their Nesting Properties Revealed by Angle-Resolved Photoemission Spectroscopy
journal, March 2011

Effects of Ru substitution on electron correlations and Fermi-surface dimensionality in Ba(Fe $_{1 - x}$ Ru $_{x}$ ) $_{2}$ As $_{2}$
journal, August 2012

Low-Temperature and High-Energy-Resolution Laser Photoemission Spectroscopy
journal, July 2015

Manifestations of multiple-carrier charge transport in the magnetostructurally ordered phase of BaFe $_{2}$ As $_{2}$
journal, November 2011

Effects of Disordered Ru Substitution in ${BaFe}_{2} {As}_{2}$ : Possible Realization of Superdiffusion in Real Materials
journal, January 2013

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

Physical and magnetic properties of $Ba {({Fe}_{1 - x} {Ru}_{x})}_{2} {As}_{2}$ single crystals
journal, July 2010

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

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

What Controls the Phase Diagram and Superconductivity in Ru-Substituted ${BaFe}_{2} {As}_{2}$ ?
journal, December 2011

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

Robust Nodal Superconductivity Induced by Isovalent Doping in $Ba ({Fe}_{1 - x} {Ru}_{x})_{2} {As}_{2}$ and ${BaFe}_{2} ({As}_{1 - x} P_{x})_{2}$
journal, February 2012

Hole and electron contributions to the transport properties of $Ba {({Fe}_{1 - x} {Ru}_{x})}_{2} {As}_{2}$ single crystals
journal, June 2010

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

Evolution of transport properties of BaFe $_{2 - x}$ Ru $_{x}$ As $_{2}$ in a wide range of isovalent Ru substitution
journal, January 2012

Unprecedented anisotropic metallic state in undoped iron arsenide BaFe2As2 revealed by optical spectroscopy
journal, July 2011

Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe $_{0.75}$ Ru $_{0.25}$ ) $_{2}$ As $_{2}$
journal, March 2013

Line nodes in the energy gap of superconducting ${BaFe}_{2} {({As}_{1 - x} P_{x})}_{2}$ single crystals as seen via penetration depth and thermal conductivity
journal, June 2010

Octet-Line Node Structure of Superconducting Order Parameter in KFe2As2
journal, September 2012

Revisiting orbital-fluctuation-mediated superconductivity in LiFeAs: Nontrivial spin-orbit interaction effects on the band structure and superconducting gap function
journal, October 2015

Influence of Spin Orbit Coupling in the Iron-Based Superconductors
text, January 2017