Superconducting properties of the oxygen-deficient iron oxyarsenide TbFeAsO 1 − δ from underdoped to overdoped compositions

  title={Superconducting properties of the oxygen-deficient iron oxyarsenide TbFeAsO 1 − $\delta$ from underdoped to overdoped compositions},
  author={Youguo Shi and S. H. Yu and Alexei A. Belik and Yoshitaka Matsushita and Masashi Tanaka and Yoshio Katsuya and Keisuke L. I. Kobayashi and Yoshiaki Hata and Hiroshi Yaśuoka and Kazunari Yamaura and Eiji Takayama-Muromachi},
  journal={Physical Review B},
A wide-range doping was achieved by a high-pressure method for TbFeAsO1-x from "under doped" to "over doped" superconducting compositions throughout the optimized superconductivity (Tc of 44 K). Tc vs. lattice constant 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… 
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