Contrasting Pressure Effects in Sr2VFeAsO3 and Sr2ScFePO3

Details Contrasting Pressure Effects in Sr2VFeAsO3 and Sr2ScFePO3 Contrasting Pressure Effects in Sr2VFeAsO3 and Sr2ScFePO3

2009-08-11

arxiv.org/abs/0908.1469v2

J. Phys. Soc. Jpn. 78 (2009) 123707.

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, to be published in J. Phys. Soc. Jpn. No.12 (2009)

Scientific paper

We report the resistivity measurements under pressure of two Fe-based superconductors with a thick perovskite oxide layer, Sr2VFeAsO3 and Sr2ScFePO3. The superconducting transition temperature Tc of Sr2VFeAsO3 markedly increases with increasing pressure. Its onset value, which was Tc{onset}=36.4 K at ambient pressure, increases to Tc{onset}=46.0 K at ~4 GPa, ensuring the potential of the "21113" system as a high-Tc material. However, the superconductivity of Sr2ScFePO3 is strongly suppressed under pressure. The Tc{onset} of ~16 K decreases to ~5 K at ~4 GPa, and the zero-resistance state is almost lost. We discuss the factor that induces this contrasting pressure effect.

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