EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor

Taichi Terashima; Motoi Kimata; Hidetaka Satsukawa; Atsushi Harada; Kaori Hazama; Shinya Uji; Hiroyuki S. Suzuki; Takehiko Matsumoto; Keizo Murata

doi:10.1143/JPSJ.78.083701

EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor

Superconductivity 2009-08-07 v2

Authors: Taichi Terashima , Motoi Kimata , Hidetaka Satsukawa , Atsushi Harada , Kaori Hazama , Shinya Uji , Hiroyuki S. Suzuki , Takehiko Matsumoto , Keizo Murata

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Abstract

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.

Keywords

iron-based superconductor single crystal superconductivity superconductivity

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@article{arxiv.0904.2618,
  title  = {EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor},
  author = {Taichi Terashima and Motoi Kimata and Hidetaka Satsukawa and Atsushi Harada and Kaori Hazama and Shinya Uji and Hiroyuki S. Suzuki and Takehiko Matsumoto and Keizo Murata},
  journal= {arXiv preprint arXiv:0904.2618},
  year   = {2009}
}

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To appear in J. Phys. Soc. Jpn., Vol. 78 No. 8

EuFe$_2$As$_2$ under high pressure: an antiferromagnetic bulk superconductor

Abstract

Keywords

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