Yang P T, Liu Z Y, Chen K Y, Liu X L, Zhang X, Yu Z H, Zhang H, Sun J P, Uwatoko Y, Dong X L, Jiang K, Hu J P, Guo Y F, Wang B S, Cheng J-G
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100190, China.
Nat Commun. 2022 May 27;13(1):2975. doi: 10.1038/s41467-022-30718-5.
We report an unusual pressure-induced superconducting state that coexists with an antiferromagnetic ordering of Eu moments and shows a large upper critical field comparable to the Pauli paramagnetic limit in EuTe. In concomitant with the emergence of superconductivity with T ≈ 3-5 K above P ≈ 6 GPa, the antiferromagnetic transition temperature T(P) experiences a quicker rise with the slope increased dramatically from dT/dP = 0.85(14) K/GPa for P ≤ P to 3.7(2) K/GPa for P ≥ P. Moreover, the superconducting state can survive in the spin-flop state with a net ferromagnetic component of the Eu sublattice under moderate magnetic fields μH ≥ 2 T. Our findings establish the pressurized EuTe as a rare magnetic superconductor possessing an intimated interplay between magnetism and superconductivity.
我们报道了一种不寻常的压力诱导超导态，它与铕（Eu）磁矩的反铁磁有序共存，并且在EuTe中表现出与泡利顺磁极限相当的大上临界场。在压力P≈6 GPa以上出现T≈3 - 5 K的超导性的同时，反铁磁转变温度T(P)经历更快的上升，其斜率从P≤P时的dT/dP = 0.85(14) K/GPa急剧增加到P≥P时的3.7(2) K/GPa。此外，在中等磁场μH≥2 T下，超导态能够在Eu亚晶格具有净铁磁分量的自旋翻转态中存续。我们的发现确立了加压的EuTe作为一种罕见的磁性超导体，其磁性和超导性之间存在密切的相互作用。
