Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films

We report on the preparation and the physical properties of superconducting (TaNb)_{1−x}(ZrHfTi)_{x} high-entropy alloy films. The films were prepared by means of magnetron sputtering at room temperature, with x ranging from 0 to 1 with an average thickness of 600–950 nm. All films crystallize in a...

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Main Authors: Xiaofu Zhang, Natascha Winter, Catherine Witteveen, Thomas Moehl, Yuan Xiao, Fabio Krogh, Andreas Schilling, Fabian O. von Rohr
Format: Article
Language:English
Published: American Physical Society 2020-03-01
Series:Physical Review Research
Online Access:http://doi.org/10.1103/PhysRevResearch.2.013375
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author Xiaofu Zhang
Natascha Winter
Catherine Witteveen
Thomas Moehl
Yuan Xiao
Fabio Krogh
Andreas Schilling
Fabian O. von Rohr
author_facet Xiaofu Zhang
Natascha Winter
Catherine Witteveen
Thomas Moehl
Yuan Xiao
Fabio Krogh
Andreas Schilling
Fabian O. von Rohr
author_sort Xiaofu Zhang
collection DOAJ
description We report on the preparation and the physical properties of superconducting (TaNb)_{1−x}(ZrHfTi)_{x} high-entropy alloy films. The films were prepared by means of magnetron sputtering at room temperature, with x ranging from 0 to 1 with an average thickness of 600–950 nm. All films crystallize in a pseudo body-centered cubic (BCC) structure. For samples with x<0.65, the normal-state properties are metallic, while for x≥0.65 the films are weakly insulating. The transition from metallic to weakly insulating occurs right at the near-equimolar stoichiometry. We find all films, except for x=0 or 1, to become superconducting at low temperatures, and we interpret their superconducting properties within the Bardeen-Cooper-Schrieffer (BCS) framework. The highest transition temperature T_{c}=6.9K of the solid solution is observed for x∼0.43. The highest upper-critical field B_{c2}(0)=11.05 T is found for the near-equimolar ratio x∼0.65, where the mixing entropy is the largest. The superconducting parameters derived for all the films from transport measurements are found to be close to those that are reported for amorphous superconductors. Our results indicate that these films of high-entropy alloys are promising candidates for superconducting device fabrication.
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spelling doaj.art-56cebf6a54e34cab9508a1330e1515152024-04-12T16:52:07ZengAmerican Physical SocietyPhysical Review Research2643-15642020-03-012101337510.1103/PhysRevResearch.2.013375Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting filmsXiaofu ZhangNatascha WinterCatherine WitteveenThomas MoehlYuan XiaoFabio KroghAndreas SchillingFabian O. von RohrWe report on the preparation and the physical properties of superconducting (TaNb)_{1−x}(ZrHfTi)_{x} high-entropy alloy films. The films were prepared by means of magnetron sputtering at room temperature, with x ranging from 0 to 1 with an average thickness of 600–950 nm. All films crystallize in a pseudo body-centered cubic (BCC) structure. For samples with x<0.65, the normal-state properties are metallic, while for x≥0.65 the films are weakly insulating. The transition from metallic to weakly insulating occurs right at the near-equimolar stoichiometry. We find all films, except for x=0 or 1, to become superconducting at low temperatures, and we interpret their superconducting properties within the Bardeen-Cooper-Schrieffer (BCS) framework. The highest transition temperature T_{c}=6.9K of the solid solution is observed for x∼0.43. The highest upper-critical field B_{c2}(0)=11.05 T is found for the near-equimolar ratio x∼0.65, where the mixing entropy is the largest. The superconducting parameters derived for all the films from transport measurements are found to be close to those that are reported for amorphous superconductors. Our results indicate that these films of high-entropy alloys are promising candidates for superconducting device fabrication.http://doi.org/10.1103/PhysRevResearch.2.013375
spellingShingle Xiaofu Zhang
Natascha Winter
Catherine Witteveen
Thomas Moehl
Yuan Xiao
Fabio Krogh
Andreas Schilling
Fabian O. von Rohr
Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films
Physical Review Research
title Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films
title_full Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films
title_fullStr Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films
title_full_unstemmed Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films
title_short Preparation and characterization of high-entropy alloy (TaNb)_{1−x}(ZrHfTi)_{x} superconducting films
title_sort preparation and characterization of high entropy alloy tanb 1 x zrhfti x superconducting films
url http://doi.org/10.1103/PhysRevResearch.2.013375
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