Contrasting Pressure Effects in Sr2VFeAsO3 and Sr2ScFePO3
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概要
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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 $T_{\text{c}}$ of Sr2VFeAsO3 markedly increases with increasing pressure. Its onset value, which was $T_{\text{c}}^{\text{onset}}=36.4$ K at ambient pressure, increases to $T_{\text{c}}^{\text{onset}}=46.0$ K at ${\sim}4$ GPa, ensuring the potential of the “21113” system as a high-$T_{\text{c}}$ material. However, the superconductivity of Sr2ScFePO3 is strongly suppressed under pressure. The $T_{\text{c}}^{\text{onset}}$ of ${\sim}16$ K decreases to ${\sim}5$ K at ${\sim}4$ GPa, and the zero-resistance state is almost lost. We discuss the factor that induces this contrasting pressure effect.
- 2009-12-15
著者
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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Tou Hideki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Murata Keizo
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Kishio Kohji
Department Of Applied Chemistry Faculty Of Engineering University Of Tokyo
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Ogino Hiraku
Department Of Applied Chemistry The University Of Tokyo
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Shimoyama Jun-ichi
Department Of Applied Chemistry School Of Engineering University Of Tokyo
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Kawazoe Takayuki
Department of Physics, Kobe University, Kobe 657-8501
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Shimoyama Jun-ichi
Department of Applied Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-8656
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Ogino Hiraku
Department of Applied Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-8656
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Kishio Kohji
Department of Applied Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-8656
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