High-entropy alloy superconductors on an α-Mn lattice

Karoline Stolze; F. Alex Cevallos; Tai Kong; Robert J. Cava

doi:10.1039/c8tc03337d

High-entropy alloy superconductors on an α-Mn lattice

Karoline Stolze, F. Alex Cevallos, Tai Kong, Robert J. Cava

Research output: Contribution to journal › Article › peer-review

73 Scopus citations

Abstract

Previously unreported High-Entropy Alloys (HEAs) in the pentanary (ZrNb)_1-x[MoReRu]_x, (HfTaWIr)_1-x[Re]_x, and (HfTaWPt)_1-x[Re]_x systems are described and characterized. The materials have body-centered cubic α-Mn-type structures and mixed site occupancies; a small stoichiometry range is observed for all, and the mixed 4d-5d system has less Re than is typically encountered for Re-containing materials with this structure type. The latter two systems are the first reported 5d-element-only superconducting HEAs. All are type-II bulk superconductors with strongly varying critical temperatures (T_cs) depending on the cubic lattice parameter a and the valence electron count (VEC); the T_cs increase linearly with decreasing a and increasing VEC within each series and fall between the trend lines found for crystalline and amorphous transition metal alloy superconductors.

Original language	English (US)
Pages (from-to)	10441-10449
Number of pages	9
Journal	Journal of Materials Chemistry C
Volume	6
Issue number	39
DOIs	https://doi.org/10.1039/c8tc03337d
State	Published - 2018
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
Materials Chemistry

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title = "High-entropy alloy superconductors on an α-Mn lattice",

abstract = "Previously unreported High-Entropy Alloys (HEAs) in the pentanary (ZrNb)1-x[MoReRu]x, (HfTaWIr)1-x[Re]x, and (HfTaWPt)1-x[Re]x systems are described and characterized. The materials have body-centered cubic α-Mn-type structures and mixed site occupancies; a small stoichiometry range is observed for all, and the mixed 4d-5d system has less Re than is typically encountered for Re-containing materials with this structure type. The latter two systems are the first reported 5d-element-only superconducting HEAs. All are type-II bulk superconductors with strongly varying critical temperatures (Tcs) depending on the cubic lattice parameter a and the valence electron count (VEC); the Tcs increase linearly with decreasing a and increasing VEC within each series and fall between the trend lines found for crystalline and amorphous transition metal alloy superconductors.",

author = "Karoline Stolze and Cevallos, {F. Alex} and Tai Kong and Cava, {Robert J.}",

note = "Funding Information: This work was supported by the Gordon and Betty Moore Foundation EPiQS program, grant GBMF-4412. The authors thank W. W. Xie for her insights into the a-Mn structure. Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",

year = "2018",

doi = "10.1039/c8tc03337d",

language = "English (US)",

volume = "6",

pages = "10441--10449",

journal = "Journal of Materials Chemistry C",

issn = "2050-7534",

publisher = "Royal Society of Chemistry",

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T1 - High-entropy alloy superconductors on an α-Mn lattice

AU - Stolze, Karoline

AU - Cevallos, F. Alex

AU - Kong, Tai

AU - Cava, Robert J.

N1 - Funding Information: This work was supported by the Gordon and Betty Moore Foundation EPiQS program, grant GBMF-4412. The authors thank W. W. Xie for her insights into the a-Mn structure. Publisher Copyright: © 2018 The Royal Society of Chemistry.

PY - 2018

Y1 - 2018

N2 - Previously unreported High-Entropy Alloys (HEAs) in the pentanary (ZrNb)1-x[MoReRu]x, (HfTaWIr)1-x[Re]x, and (HfTaWPt)1-x[Re]x systems are described and characterized. The materials have body-centered cubic α-Mn-type structures and mixed site occupancies; a small stoichiometry range is observed for all, and the mixed 4d-5d system has less Re than is typically encountered for Re-containing materials with this structure type. The latter two systems are the first reported 5d-element-only superconducting HEAs. All are type-II bulk superconductors with strongly varying critical temperatures (Tcs) depending on the cubic lattice parameter a and the valence electron count (VEC); the Tcs increase linearly with decreasing a and increasing VEC within each series and fall between the trend lines found for crystalline and amorphous transition metal alloy superconductors.

AB - Previously unreported High-Entropy Alloys (HEAs) in the pentanary (ZrNb)1-x[MoReRu]x, (HfTaWIr)1-x[Re]x, and (HfTaWPt)1-x[Re]x systems are described and characterized. The materials have body-centered cubic α-Mn-type structures and mixed site occupancies; a small stoichiometry range is observed for all, and the mixed 4d-5d system has less Re than is typically encountered for Re-containing materials with this structure type. The latter two systems are the first reported 5d-element-only superconducting HEAs. All are type-II bulk superconductors with strongly varying critical temperatures (Tcs) depending on the cubic lattice parameter a and the valence electron count (VEC); the Tcs increase linearly with decreasing a and increasing VEC within each series and fall between the trend lines found for crystalline and amorphous transition metal alloy superconductors.

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JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 39

ER -

High-entropy alloy superconductors on an α-Mn lattice

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