Sun, HualeiQiu, LiangHan, YifengZhang, YunweiWang, WeiliangHuang, ChaoxinLiu, NaitianHuo, MengwuLi, LisiLiu, HuiLiu, ZengjiaCheng, PengZhang, HongxiaWang, HongliangHao, LijieLi, Man-RongYao, Dao-XinHou, YushengDai, PengchengWang, Meng2023-03-232023-03-232023Sun, Hualei, Qiu, Liang, Han, Yifeng, et al.. "Exchange field enhanced upper critical field of the superconductivity in compressed antiferromagnetic EuTe2." <i>Communications Physics,</i> 6, (2023) Springer Nature: https://doi.org/10.1038/s42005-023-01155-7.https://hdl.handle.net/1911/114538Understanding the interplay between superconductivity and magnetism has been a longstanding challenge in condensed matter physics. Here we report high pressure studies on the C-type antiferromagnetic semiconductor EuTe2 up to 36.0 GPa. A structural transition from the I4/mcm to the C2/m space group is identified at ~16 GPa. Superconductivity is observed above ~5 GPa in both structures. In the low-pressure phase, magnetoresistance measurements reveal strong couplings between the local moments of Eu2+ and the conduction electrons of Te 5p orbits. The upper critical field of superconductivity is well above the Pauli limit. While EuTe2 becomes nonmagnetic in the high-pressure phase and the upper critical field drops below the Pauli limit. Our results demonstrate that the high upper critical field of EuTe2 in the low-pressure phase is due to the exchange field compensation effect of Eu2+ and the superconductivity in both structures may arise in the framework of the Bardeen-Cooper-Schrieffer theory.engThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.Journal articles42005-023-01155-7https://doi.org/10.1038/s42005-023-01155-7