RuAl6- An Endohedral Aluminide Superconductor

Zuzanna Ryżyńska; Juan R. Chamorro; Tyrel M. McQueen; Piotr Wiśniewski; Dariusz Kaczorowski; Weiwei Xie; Robert J. Cava; Tomasz Klimczuk; Michał J. Winiarski

doi:10.1021/acs.chemmater.9b05277

RuAl₆- An Endohedral Aluminide Superconductor

Zuzanna Ryżyńska, Juan R. Chamorro, Tyrel M. McQueen, Piotr Wiśniewski, Dariusz Kaczorowski, Weiwei Xie, Robert J. Cava, Tomasz Klimczuk, Michał J. Winiarski

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13 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	3805-3812
Number of pages	8
Journal	Chemistry of Materials
Volume	32
Issue number	9
DOIs	https://doi.org/10.1021/acs.chemmater.9b05277
State	Published - May 12 2020

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering
Materials Chemistry

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title = "RuAl6- An Endohedral Aluminide Superconductor",

abstract = "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.",

author = "Zuzanna Ry{\.z}y{\'n}ska and Chamorro, {Juan R.} and McQueen, {Tyrel M.} and Piotr Wi{\'s}niewski and Dariusz Kaczorowski and Weiwei Xie and Cava, {Robert J.} and Tomasz Klimczuk and Winiarski, {Micha{\l} J.}",

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doi = "10.1021/acs.chemmater.9b05277",

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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.

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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RuAl₆- An Endohedral Aluminide Superconductor

Abstract

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