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Title: Effect of electron count and chemical complexity in the Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor

High-entropy alloys are made from random mixtures of principal elements on simple lattices, stabilized by a high mixing entropy. The recently discovered body-centered cubic (BCC) Ta-Nb-Hf-Zr-Ti high-entropy alloy superconductor appears to display properties of both simple crystalline intermetallics and amorphous materials; e.g., it has a well-defined superconducting transition along with an exceptional robustness against disorder. Here we show that the valence electron count dependence of the superconducting transition temperature in the high-entropy alloy falls between those of analogous simple solid solutions and amorphous materials and test the effect of alloy complexity on the superconductivity. We propose high-entropy alloys as excellent intermediate systems for studying superconductivity as it evolves between crystalline and amorphous materials.
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [1]
  1. Princeton Univ., NJ (United States). Dept. of Chemistry
  2. Gdansk Univ. of Technology (Poland). Faculty of Applied Physics and Mathematics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics
Publication Date:
Report Number(s):
BNL-113907-2017-JA
Journal ID: ISSN 0027-8424; R&D Project: MA015MACA; KC0201010
Grant/Contract Number:
SC0012704; AC02-98CH10886; DEC-2012/07/E/ST3/00584; GBMF-4412
Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 113; Journal Issue: 46; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Gordon and Betty Moore Foundation; National Science Centre (Poland)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; High-entropy Alloys; Superconductivity; Disordered Metals
OSTI Identifier:
1330724
Alternate Identifier(s):
OSTI ID: 1372433