Superconducting properties of the oxygen-deficient iron oxyarsenide TbFeAsO1−δ from underdoped to overdoped compositions
Y. G. Shi, S. Yu, A. A. Belik, Y. Matsushita, M. Tanaka, Y. Katsuya, K. Kobayashi, Y. Hata, H. Yasuoka, K. Yamaura, E. Takayama-Muromachi
DOI 10.1103/PhysRevB.80.104501 · Physical Review B
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Abstract
A wide-range doping was achieved by a high-pressure method for TbFeAsO1−δ from “underdoped” to “overdoped” superconducting compositions throughout the optimized superconductivity (Tc of 44 K). Tc vs δ shows a dome-shaped feature, while Tc vs the lattice constant likely follows a unique empirical curve over the doping range. The relatively large amount of oxygen vacancies up to ∼0.3 per the formula unit was introduced possibly because of the smaller replacement Tb than the other Ln (rare-earth element) in the LnFeAsO1−δ system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TbFeAsO1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | onset |
| TbFeAsO1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | onset |
| SmFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 56 | Pressure not reported | unknown |
| NdFeAsO1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 51 | Pressure not reported | unknown |
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