EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor
| Autor: | Terashima, Taichi, Kimata, Motoi, Satsukawa, Hidetaka, Harada, Atsushi, Hazama, Kaori, Uji, Shinya, Suzuki, Hiroyuki S., Matsumoto, Takehiko, Murata, Keizo |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 78, 083701 (2009) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1143/JPSJ.78.083701 |
| Popis: | We report the ac magnetic susceptibility $\chi_{ac}$ and resistivity $\rho$ measurements of EuFe$_2$As$_2$ 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 $T_c \sim$~30 K in EuFe$_2$As$_2$. $\rho$ shows an anomalous nearly linear temperature dependence from room temperature down to $T_c$ at the same $P$. $\chi_{ac}$ indicates that an antiferromagnetic order of Eu$^{2+}$ moments with $T_N \sim$~20 K persists in the superconducting phase. The temperature dependence of the upper critical field is also determined. Comment: To appear in J. Phys. Soc. Jpn., Vol. 78 No. 8 |
| Databáze: | arXiv |
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