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...
Main Authors: | , , , , , , , |
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Format: | Article |
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American Physical Society
2020-03-01
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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. |
first_indexed | 2024-04-24T10:26:57Z |
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id | doaj.art-56cebf6a54e34cab9508a1330e151515 |
institution | Directory Open Access Journal |
issn | 2643-1564 |
language | English |
last_indexed | 2024-04-24T10:26:57Z |
publishDate | 2020-03-01 |
publisher | American Physical Society |
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series | Physical Review Research |
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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