Interpretation of high-pressure experiments on FeAs superconductors
| dc.creator | Huang, Xiuqing | |
| dc.date | 2008-05-03 | |
| dc.date.accessioned | 2026-07-07T09:36:53Z | |
| dc.date.available | 2026-07-07T09:36:53Z | |
| dc.description | In two recent articles (cond-mat/0606177 and arXiv:0804.1615), we have suggested a unified theory of superconductivity based on the real-space spin-parallel electron pairing and superconducting mechanism and have shown that the stable hexagonal and tetragonal vortex lattices (the optimal doping phases) can be expected in the newly discovered LaO{1-x}F{x}FeAs (x0=1/7=0.1428) and SmO{1-x}F{x}FeAs (x0=1/6=0.1667), respectively. In this paper, we present a theoretical study of the effects of hydrostatic and anisotropic pressure on the superconducting transition temperature Tc of the Fe-based layered superconductors based on the above mentioned theory. Our results indicate a strong doping-dependent pressure effects on the Tc of this compound system. Under high hydrostatic pressure, we find that dTc/dP is negative when x>x0 (the so-called overdoped region) and is positive when x<x0 (the so-called underdoped region). Qualitatively, our finding is in good agreement with the existing experimental data in LaO{1-x}F{x}FeAs (x=0.11<1/7) (arXiv:0803.4266) and SmO{1-x}F{x}FeAs (x=0.13<1/6 and x=0.3>1/6) (arXiv:0804.1582). Furthermore, Tc of both overdoped and underdoped samples shows an increase with uniaxial pressure in the charge stripe direction and a decrease with pressure in the direction perpendicular to the stripes. We suggest that the mechanism responsible for the pressure effect is not specific to the iron-based family and it may also be applicable to other superconducting materials. | |
| dc.description | 9 pages, 10 figures | |
| dc.identifier | https://arxiv.org/abs/0805.0355 | |
| dc.identifier | http://arxiv.org/abs/0805.0355 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/160277 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.subject | Superconductivity | |
| dc.title | Interpretation of high-pressure experiments on FeAs superconductors | |
| dc.type | text |