Enhancement of the superconducting gap by nesting in CaKFe4As4: A new high temperature superconductor

Mou, Daixiang; Kong, Tai; Meier, William R.; Lochner, Felix; Wang, Lin -Lin; Lin, Qisheng; Wu, Yun; Bud’ko, S. L.; Eremin, Ilya; Johnson, D. D.; Canfield, P. C.; Kaminski, Adam

doi:10.1103/PhysRevLett.117.277001

Title: Enhancement of the superconducting gap by nesting in ${CaKFe}_{4} {As}_{4}$ : A new high temperature superconductor

Journal Article · Wed Dec 28 00:00:00 EST 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.277001· OSTI ID:1347412

Mou, Daixiang ^[1]; Kong, Tai ^[1]; Meier, William R. ^[1]; Lochner, Felix ^[2]; Wang, Lin -Lin ^[3]; Lin, Qisheng ^[3]; Wu, Yun ^[1]; Bud’ko, S. L. ^[1]; Eremin, Ilya ^[2]; Johnson, D. D. ^[1]; Canfield, P. C. ^[1]; Kaminski, Adam ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Ruhr-Univ. Bochum, Bochum (Germany)
Ames Lab., Ames, IA (United States)

We use high resolution angle resolved photoemission spectroscopy and density functional theory with measured crystal structure parameters to study the electronic properties of CaKFe₄As₄. In contrast to the related CaFe₂As₂ compounds, CaKFe₄As₄ has a high T_c of 35 K at stochiometric composition. This presents a unique opportunity to study the properties of high temperature superconductivity in the iron arsenides in the absence of doping or substitution. The Fermi surface consists of several hole and electron pockets that have a range of diameters. We find that the values of the superconducting gap are nearly isotropic (within the explored portions of the Brillouin zone), but are significantly different for each of the Fermi surface (FS) sheets. Most importantly, we find that the momentum dependence of the gap magnitude plotted across the entire Brillouin zone displays a strong deviation from the simple cos(k_x)cos(k_y) functional form of the gap function, proposed by the scenario of Cooper pairing driven by a short range antiferromagnetic exchange interaction. Instead, the maximum value of the gap is observed on FS sheets that are closest to the ideal nesting condition, in contrast to previous observations in other ferropnictides. Finally, these results provide strong support for the multiband character of superconductivity in CaKFe₄As₄, in which Cooper pairing forms on the electron and the hole bands interacting via a dominant interband repulsive interaction, enhanced by band nesting.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358; ER463/8; ER463/8-1; 57316180; GBMF4411

OSTI ID:: 1347412

Alternate ID(s):: OSTI ID: 1338133; OSTI ID: 1347744

Report Number(s):: IS-J-9162; IS-J-9203; PRLTAO; TRN: US1701075

Journal Information:: Physical Review Letters, Vol. 117, Issue 27; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 62 works

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Electronic Properties and Fermi Surface for New Layered High-Temperature Superconductors CaAFe4As4 (A = K, Rb, and Cs): FLAPW-GGA Calculations Suetin, D. V.; Shein, I. R. Journal of Superconductivity and Novel Magnetism, Vol. 31, Issue 6 https://doi.org/10.1007/s10948-017-4404-y	journal	November 2017
A brief review on μSR studies of unconventional Fe- and Cr-based superconductors Bhattacharyya, A.; Adroja, D. T.; Smidman, M. Science China Physics, Mechanics & Astronomy, Vol. 61, Issue 12 https://doi.org/10.1007/s11433-018-9292-0	journal	October 2018
Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor Meier, William R.; Ding, Qing-Ping; Kreyssig, Andreas npj Quantum Materials, Vol. 3, Issue 1 https://doi.org/10.1038/s41535-017-0076-x	journal	February 2018
Odd and Even Modes of Neutron Spin Resonance in the Bilayer Iron-Based Superconductor ${CaKFe}_{4} {As}_{4}$ Xie, Tao; Wei, Yuan; Gong, Dongliang Physical Review Letters, Vol. 120, Issue 26 https://doi.org/10.1103/physrevlett.120.267003	journal	June 2018
⁷⁵As NMR Studies of Magnetic Properties of the Magnetic Superconductor CaK(Fe_0.967Ni_0.033)₄As₄ Ding, Qing Ping; Meier, William R.; Böhmer, Anna E. Solid State Phenomena, Vol. 289 https://doi.org/10.4028/www.scientific.net/ssp.289.148	journal	April 2019
Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor Meier, W. R.; Ding, Q. -P.; Kreyssig, A. arXiv https://doi.org/10.48550/arxiv.1706.01067	text	January 2017
Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials Korshunov, M. M. arXiv https://doi.org/10.48550/arxiv.1803.06736	text	January 2018
A brief review on muSR studies of unconventional Fe and Cr-based superconductors Bhattacharyya, A.; Adroja, D. T.; Smidman, M. arXiv https://doi.org/10.48550/arxiv.1811.12677	text	January 2018

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Title: Enhancement of the superconducting gap by nesting in ${CaKFe}_{4} {As}_{4}$ : A new high temperature superconductor