Unusual pressure effects on the superconductivity of indirectly electron-doped (Ba1−xLax)Fe2As2 epitaxial films
Takayoshi Katase, Hikaru Sato, Hidenori Hiramatsu, Toshio Kamiya, Hideo Hosono
DOI 10.1103/PhysRevB.88.140503 · Physical Review B
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Abstract
Applying an external pressure to indirectly electron-doped 122-type (Ba1−xLax)Fe2As2 epitaxial films enhances the superconducting critical temperature (Tc) up to 30.3 K. Different from the other family compounds, the Tc is enhanced not only in the underdoped region but also in the optimally doped and overdoped regions. Narrowing of the superconducting transition width and an increase in the carrier density take place simultaneously in the whole doping region, except at the heavily overdoped limit. This characteristic is unique to and is observed only in (Ba1−xLax)Fe2As2, in which the La doping is stabilized via nonequilibrium growth of the vapor phase epitaxy, among the 122-type iron-based superconductors, AFe2As2 (A = Ba, Sr, and Ca).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ba1-xLax)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.3 | 2.8 GPa | onset |
| (Ba1-xLax)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure unresolved | onset |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | 1 GPa | unknown |
| CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 49 | Pressure not reported | unknown |
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