Superconductivity is reported in an endohedral aluminide compound, RuAl6, with Tc = 1.21 K. The normalized heat capacity jump at Tc, ΔC/γTc = 1.58, confirms bulk superconductivity. The Ginzburg–Landau parameter of κ = 9.5 shows that RuAl6 is a type-II superconductor. Electronic structure calculations for RuAl6 are explored in comparison to its structural analogue ReAl6 (Tc = 0.74 K). The stability of the phases is discussed in terms of the crystal orbital Hamilton population (−COHP) analysis. The difference in Tc in the two materials is caused by the significantly stronger electron–phonon coupling found in RuAl6, which is a result of significantly stronger antibonding interactions. The presence of superconductivity in yet another compound made of aluminum clusters possibly expands the correlation of critical temperature and the structure shown for Ga-built clusters.
Authors
- Zuzanna Ryżyńska link open in new tab ,
- Juan Chamorro,
- Tyrel McQueen,
- Piotr Wiśniewski,
- Dariusz Kaczorowski,
- Weiwei Xie,
- Robert J. Cava,
- prof. dr hab. inż. Tomasz Klimczuk link open in new tab ,
- dr inż. Michał Winiarski link open in new tab
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1021/acs.chemmater.9b05277
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2020
Source: MOSTWiedzy.pl - publication "RuAl6—An Endohedral Aluminide Superconductor" link open in new tab
