Enhancement of the superconducting gap by nesting in : A new high temperature superconductor
Abstract
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 Tc 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(kx)cos(ky) 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 ofmore »
- Authors:
-
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Ruhr-Univ. Bochum, Bochum (Germany)
- Ames Lab., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1347412
- Alternate Identifier(s):
- OSTI ID: 1338133; OSTI ID: 1347744
- Report Number(s):
- IS-J-9162; IS-J-9203
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1701075
- Grant/Contract Number:
- AC02-07CH11358; ER463/8; ER463/8-1; 57316180; GBMF4411
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 117; Journal Issue: 27; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
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., and Kaminski, Adam. Enhancement of the superconducting gap by nesting in CaKFe4As4: A new high temperature superconductor. United States: N. p., 2016.
Web. doi:10.1103/PhysRevLett.117.277001.
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. Enhancement of the superconducting gap by nesting in CaKFe4As4: A new high temperature superconductor. United States. https://doi.org/10.1103/PhysRevLett.117.277001
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., and Kaminski, Adam. Wed .
"Enhancement of the superconducting gap by nesting in CaKFe4As4: A new high temperature superconductor". United States. https://doi.org/10.1103/PhysRevLett.117.277001. https://www.osti.gov/servlets/purl/1347412.
@article{osti_1347412,
title = {Enhancement of the superconducting gap by nesting in CaKFe4As4: A new high temperature superconductor},
author = {Mou, Daixiang and Kong, Tai and Meier, William R. and Lochner, Felix and Wang, Lin -Lin and Lin, Qisheng and Wu, Yun and Bud’ko, S. L. and Eremin, Ilya and Johnson, D. D. and Canfield, P. C. and Kaminski, Adam},
abstractNote = {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 Tc 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(kx)cos(ky) 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.},
doi = {10.1103/PhysRevLett.117.277001},
journal = {Physical Review Letters},
number = 27,
volume = 117,
place = {United States},
year = {Wed Dec 28 00:00:00 EST 2016},
month = {Wed Dec 28 00:00:00 EST 2016}
}
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