We report the ac magnetic susceptibility X ac and resistivity ρ measurements of EuFe 2As 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 ∼ 30K in EuFe 2As 2. ρ shows an anomalous nearly linear temperature dependence from room temperature down to T c at the same P. X ac indicates that an antiferromagnetic order of Eu 2+ moments with T n ∼ 20 K persists in the superconducting phase. The temperature dependence of the upper critical field is also determined.
- Iron pnictides
- Pressure-induced superconductivity
- Upper critical field