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It is shown that the superconductivity in Ce 1− x Gd x FeAsO 0.84 F 0.16 compounds can be modulated by internal (chemical) pressure. The internal pressure is induced by Gd substitution for Ce in CeFeAsO 0.84 F 0.16 , which compresses the crystal lattice. The temperature dependences of resistivity and magnetization show that the superconducting-transition temperature T c is enhanced from 40 K for CeFeAsO 0.84 F 0.16 to 47.5 K for Ce 0.6 Gd 0.4 FeAsO 0.84 F 0.16 . The increase and subsequent decrease of T c upon application of external pressure, as observed previously in LaFeAsO 0.89 F 0.11 , is entirely confirmed by the modulation of T c of the Ce 1− x Gd x FeAsO 0.84 F 0.16 superconductors by internal pressure.
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Yang et al. (2009) studied this question.
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