Pressured-induced superconducting phase with large upper critical field and concomitant enhancement of antiferromagnetic transition in EuTe2

P. T. Yang, Z. Y. Liu, K. Y. Chen, X. L. Liu, X. Zhang, Z. H. Yu, H. Zhang, J. P. Sun, Y. Uwatoko, X. L. Dong, K. Jiang, J. P. Hu, Y. F. Guo (), B. S. Wang () and J.-G. Cheng ()
Additional contact information
P. T. Yang: Chinese Academy of Sciences
Z. Y. Liu: Chinese Academy of Sciences
K. Y. Chen: Chinese Academy of Sciences
X. L. Liu: Shanghai Tech University
X. Zhang: Shanghai Tech University
Z. H. Yu: Shanghai Tech University
H. Zhang: Chinese Academy of Sciences
J. P. Sun: Chinese Academy of Sciences
Y. Uwatoko: University of Tokyo, Kashiwa
X. L. Dong: Chinese Academy of Sciences
K. Jiang: Chinese Academy of Sciences
J. P. Hu: Chinese Academy of Sciences
Y. F. Guo: Shanghai Tech University
B. S. Wang: Chinese Academy of Sciences
J.-G. Cheng: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract We report an unusual pressure-induced superconducting state that coexists with an antiferromagnetic ordering of Eu2+ moments and shows a large upper critical field comparable to the Pauli paramagnetic limit in EuTe2. In concomitant with the emergence of superconductivity with Tc ≈ 3–5 K above Pc ≈ 6 GPa, the antiferromagnetic transition temperature TN(P) experiences a quicker rise with the slope increased dramatically from dTN/dP = 0.85(14) K/GPa for P ≤ Pc to 3.7(2) K/GPa for P ≥ Pc. Moreover, the superconducting state can survive in the spin-flop state with a net ferromagnetic component of the Eu2+ sublattice under moderate magnetic fields μ0H ≥ 2 T. Our findings establish the pressurized EuTe2 as a rare magnetic superconductor possessing an intimated interplay between magnetism and superconductivity.

Date: 2022
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DOI: 10.1038/s41467-022-30718-5

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