Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds
Abstract
Here, the pairing symmetry is examined in highly electron-doped Ba (Fe1-x Cox As)2 and Ay Fe2 Se2 (with A = K, Cs) compounds, with similar crystallographic and electronic band structures. Starting from a phenomenological two-orbital model, we consider nearest-neighbor and next-nearest-neighbor intraorbital pairing interactions on the Fe square lattice. In this model, we find a unified description of the evolution from s±-wave pairing (2.0 < n ≲ 2.4) to d-wave pairing (2.4 ≲ n ≲ 2.5) as a function of electron filling. In the crossover region, a time-reversal symmetry breaking s± + id pairing state emerges. This minimal model offers an overall picture of the evolution of superconductivity with electron doping for both s±-wave and d-wave pairings, as long as the dopants only play the role of a charge reservoir. However, the situation is more complicated for Ba (Fe1-x Cox As)2. A real-space study further shows that when the impurity scattering effects of Co dopants are taken into account, the superconductivity is completely suppressed for n > 2.4. This preempts any observation of d-wave pairing in this compound, in contrast to Ay Fe2 Se2 with 0.8 < y < 1.0.
- Authors:
-
- Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity
- Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity; Yangzhou Univ. (China). School of Physics Science and Technology
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Robert A. Welch Foundation
- OSTI Identifier:
- 1457233
- Alternate Identifier(s):
- OSTI ID: 1198527
- Report Number(s):
- LA-UR-15-22100
Journal ID: ISSN 1098-0121; PRBMDO; TRN: US1901318
- Grant/Contract Number:
- AC52-06NA25396; DMR-1206839; E-1146
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 22; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Li, Bo, Pan, Lihua, Tai, Yuan-Yen, Graf, Matthias J., Zhu, Jian-Xin, Bassler, Kevin E., and Ting, C. S. Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.220509.
Li, Bo, Pan, Lihua, Tai, Yuan-Yen, Graf, Matthias J., Zhu, Jian-Xin, Bassler, Kevin E., & Ting, C. S. Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds. United States. https://doi.org/10.1103/PhysRevB.91.220509
Li, Bo, Pan, Lihua, Tai, Yuan-Yen, Graf, Matthias J., Zhu, Jian-Xin, Bassler, Kevin E., and Ting, C. S. Fri .
"Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds". United States. https://doi.org/10.1103/PhysRevB.91.220509. https://www.osti.gov/servlets/purl/1457233.
@article{osti_1457233,
title = {Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds},
author = {Li, Bo and Pan, Lihua and Tai, Yuan-Yen and Graf, Matthias J. and Zhu, Jian-Xin and Bassler, Kevin E. and Ting, C. S.},
abstractNote = {Here, the pairing symmetry is examined in highly electron-doped Ba (Fe1-x Cox As)2 and Ay Fe2 Se2 (with A = K, Cs) compounds, with similar crystallographic and electronic band structures. Starting from a phenomenological two-orbital model, we consider nearest-neighbor and next-nearest-neighbor intraorbital pairing interactions on the Fe square lattice. In this model, we find a unified description of the evolution from s±-wave pairing (2.0 < n ≲ 2.4) to d-wave pairing (2.4 ≲ n ≲ 2.5) as a function of electron filling. In the crossover region, a time-reversal symmetry breaking s± + id pairing state emerges. This minimal model offers an overall picture of the evolution of superconductivity with electron doping for both s±-wave and d-wave pairings, as long as the dopants only play the role of a charge reservoir. However, the situation is more complicated for Ba (Fe1-x Cox As)2. A real-space study further shows that when the impurity scattering effects of Co dopants are taken into account, the superconductivity is completely suppressed for n > 2.4. This preempts any observation of d-wave pairing in this compound, in contrast to Ay Fe2 Se2 with 0.8 < y < 1.0.},
doi = {10.1103/PhysRevB.91.220509},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 91,
place = {United States},
year = {Fri Jun 26 00:00:00 EDT 2015},
month = {Fri Jun 26 00:00:00 EDT 2015}
}
Web of Science
Figures / Tables:
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