Pressured-induced superconducting phase with large upper critical field and concomitant enhancement of antiferromagnetic transition in EuTe 2

We report an unusual pressure-induced superconducting state that coexists with an antiferromagnetic ordering of Eu 2+ moments and shows a large upper critical field comparable to the Pauli paramagnetic limit in EuTe 2 . In concomitant with the emergence of superconductivity with T c ≈ 3–5 K above P c ≈ 6 GPa, the antiferromagnetic transition temperature T N ( P ) experiences a quicker rise with the slope increased dramatically from d T N /d P = 0.85(14) K/GPa for P ≤ P c to 3.7(2) K/GPa for P ≥ P c . Moreover, the superconducting state can survive in the spin-flop state with a net ferromagnetic component of the Eu 2+ sublattice under moderate magnetic fields μ 0 H ≥ 2 T. Our findings establish the pressurized EuTe 2 as a rare magnetic superconductor possessing an intimated interplay between magnetism and superconductivity.