TY - JOUR
T1 - RuAl6- An Endohedral Aluminide Superconductor
AU - Ryżyńska, Zuzanna
AU - Chamorro, Juan R.
AU - McQueen, Tyrel M.
AU - Wiśniewski, Piotr
AU - Kaczorowski, Dariusz
AU - Xie, Weiwei
AU - Cava, Robert J.
AU - Klimczuk, Tomasz
AU - Winiarski, Michał J.
N1 - Funding Information:
This work was supported as part of the Institute for the Quantum Matter, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under award DE-SC0019331. The research performed at the Gdansk University of Technology was supported by the National Science Centre (Poland) grant (UMO-2016/22/M/ST5/00435). The work at Princeton University was funded by the US DOE Division of Basic Energy Sciences, grant DE-FG02-ER45706. J.R.C. acknowledges the Gompf Family Fellowship for support. T.M.M. acknowledges support of the David and Lucile Packard Foundation. M.J.W. was supported by the Foundation for Polish Science (FNP).
PY - 2020/5/12
Y1 - 2020/5/12
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.chemmater.9b05277
DO - 10.1021/acs.chemmater.9b05277
M3 - Article
AN - SCOPUS:85097845175
VL - 32
SP - 3805
EP - 3812
JO - Chemistry of Materials
JF - Chemistry of Materials
SN - 0897-4756
IS - 9
ER -