The class of unconventional superconductors, particularly noncentrosymmetric superconductors, has been highly considered as potential materials for understanding the complex properties of quantum materials. Here, five previously unreported Re3.5Os3.5Ta0.5Hf0.5Nb3, Re3Os3Ta0.5Hf0.5Nb3, Re3.5Os3.5Mo0.5Hf0.5Nb3, Re3.5Os3.5Mo0.5W0.5Nb3, and Re3Os3Mo0.5Hf0.5Nb3 Re-Os-based high/medium-entropy alloys (MEAs-HEAs) with valence electron count ranging from 6.45 to 6.81 were synthesized and investigated using x-ray diffraction, transport, magnetization, and specific heat measurements. Our analyses confirm that all five compounds crystallize in a noncentrosymmetric {\alpha}-Mn-type structure and exhibit type-II superconductivity with Tc values from 4.20 K to 5.11 K, respectively. Unexpectedly, despite being immersed in an acidic environment for one month, the structures and superconducting properties of HEAs remain stable. Our findings indicate that the Tc increases with an increasing valence electron count in MEAs-HEAs. Furthermore, these noncentrosymmetric {\alpha}-Mn-type HEA superconductors have large Kadowaki-Woods ratios (KWR), implying the presence of strong electronic correlations.
@article{arxiv.2508.05010,
title = {Strongly correlated electronic superconductivity in the noncentrosymmetric Re-Os-based high/medium-entropy alloys},
author = {Rui Chen and Longfu Li and Lingyong Zeng and Kuan Li and Peifeng Yu and Kangwang Wang and Zaichen Xiang and Shuangyue Wang and Jingjun Qin and Wanyi Zhang and Yucheng Li and Tian Shang and Huixia Luo},
journal= {arXiv preprint arXiv:2508.05010},
year = {2025}
}
Comments
27 pages, 7 figures, 1 table; The manuscript with the same title will be published by Acta Materialia