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This content will become publicly available on February 10, 2017

Title: Retaining large and adjustable elastic strains of kilogram-scale Nb nanowires [Better Superconductor by Elastic Strain Engineering: Kilogram-scale Free-Standing Niobium Metal Composite with Large Retained Elastic Strains]

Crystals held at ultrahigh elastic strains and stresses may exhibit exceptional physical and chemical properties. Individual metallic nanowires can sustain ultra-large elastic strains of 4-7%. However, retaining elastic strains of such magnitude in kilogram-scale nanowires is challenging. Here, we find that under active load, ~5.6% elastic strain can be achieved in Nb nanowires in a composite material. Moreover, large tensile (2.8%) and compressive (-2.4%) elastic strains can be retained in kilogram-scale Nb nanowires when the composite is unloaded to a free-standing condition. It is then demonstrated that the retained tensile elastic strains of Nb nanowires significantly increase their superconducting transition temperature and critical magnetic fields, corroborating ab initio calculations based on BCS theory. This free-standing nanocomposite design paradigm opens new avenues for retaining ultra-large elastic strains in great quantities of nanowires and elastic-strain-engineering at industrial scale.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9]
  1. China Univ. of Petroleum, Beijing (China). State Key lab. of Heavy Oil Processing
  2. Xi'an Jiaotong Univ. (China). State Key Lab. for Mechanical Behavior of Materials and Frontier Inst. of Science and Technology
  3. Univ. of Western Australia, Crawley, WA (Australia). School of Mechanical and Chemcial Engineering; China Univ. of Petroleum, Beijing (China). State Key lab. of Heavy Oil Processing
  4. Univ. of Western Australia, Crawley, WA (Australia). School of Mechanical and Chemcial Engineering
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Div.; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  6. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Div.
  7. Beijing Univ. of Technology, (China). Inst. of Microsctructure and Properties of Advanced Materials
  8. Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  9. Xi'an Jiaotong Univ. (China). State Key Lab. for Mechanical Behavior of Materials and Frontier Inst. of Science and Technology; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Nuclear Science and Engineering and Dept. of Materials Science and Engineering
Publication Date:
OSTI Identifier:
1261336
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE