TY - JOUR
T1 - Strongly correlated electronic superconductivity in the noncentrosymmetric Re-Os-based high/medium-entropy alloys
AU - Chen, Rui
AU - Li, Longfu
AU - Zeng, Lingyong
AU - Li, Kuan
AU - Yu, Peifeng
AU - Wang, Kangwang
AU - Xiang, Zaichen
AU - Wang, Shuangyue
AU - Qin, Jingjun
AU - Zhang, Wanyi
AU - Li, Yucheng
AU - Shang, Tian
AU - Luo, Huixia
N1 - Publisher Copyright:
© 2025 Acta Materialia Inc.
PY - 2025/10/1
Y1 - 2025/10/1
N2 - 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 α-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 α-Mn-type HEA superconductors have large Kadowaki-Woods ratios (KWR), implying the presence of strong electronic correlations.
AB - 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 α-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 α-Mn-type HEA superconductors have large Kadowaki-Woods ratios (KWR), implying the presence of strong electronic correlations.
KW - High/medium-entropy alloy
KW - Noncentrosymmetric structure
KW - Strong electronic correlations
KW - Superconductors
UR - https://www.scopus.com/pages/publications/105012616539
U2 - 10.1016/j.actamat.2025.121401
DO - 10.1016/j.actamat.2025.121401
M3 - 文章
AN - SCOPUS:105012616539
SN - 1359-6454
VL - 298
JO - Acta Materialia
JF - Acta Materialia
M1 - 121401
ER -