EuFe2As2 under High Pressure: An Antiferromagnetic Bulk Superconductor
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概要
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We report the ac magnetic susceptibility $\chi_{\text{ac}}$ and resistivity $\rho$ measurements of EuFe2As2 under high pressure $P$. By observing nearly 100% superconducting shielding and zero resistivity at $P=28$ kbar, we establish that $P$-induced superconductivity occurs at $T_{\text{c}}\sim 30$ K in EuFe2As2. $\rho$ shows an anomalous nearly linear temperature dependence from room temperature down to $T_{\text{c}}$ at the same $P$. $\chi_{\text{ac}}$ indicates that an antiferromagnetic order of Eu2+ moments with $T_{\text{N}}\sim 20$ K persists in the superconducting phase. The temperature dependence of the upper critical field is also determined.
- 2009-08-15
著者
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TERASHIMA Taichi
National Institute for Materials Science
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KIMATA Motoi
National Institute for Materials Science
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SATSUKAWA Hidetaka
National Institute for Materials Science
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HAZAMA Kaori
National Institute for Materials Science
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UJI Shinya
National Institute for Materials Science
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Murata Keizo
Division Of Molecular Materials Science Graduate School Of Science Osaka City University
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Matsumoto Takehiko
National Institute For Materials Science
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Suzuki Hiroyuki
National Institute For Material Science
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Harada Atsushi
National Center For Geriatrics And Gerontology
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