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Title: Enhancing superconducting critical current by randomness

Journal Article · · Physical Review B
 [1];  [2];  [2];  [3];  [3];  [4];  [4];  [5];  [3]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Notre Dame, IN (United States). Dept. of Physics
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Univ. of Illinois, Champaign, IL (United States). Dept. of Physics, Electrical and Mechanical Engineering

The key ingredient of high critical currents in a type-II superconductor is defect sites that pin vortices. Here, we demonstrate that a random pinscape, an overlooked pinning system in nanopatterned superconductors, can lead to a substantially larger critical current enhancement at high magnetic fields than an ordered array of vortex pin sites. We reveal that the better performance of a random pinscape is due to the variation of the local density of its pinning sites, which mitigates the motion of vortices. This is confirmed by achieving even higher enhancement of the critical current through a conformally mapped random pinscape, where the distribution of the local density of pinning sites is further enlarged. Our findings highlight the potential of random pinscapes in enhancing the superconducting critical currents of applied superconductors in which random pin sites of nanoscale defects emerging in the materials synthesis process or through ex-situ irradiation are the only practical choice for large-scale production. Our results may also stimulate research on effects of a random pinscape in other complementary systems such as colloidal crystals, Bose-Einstein condensates, and Luttinger liquids.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1407175
OSTI ID:
1248955
Alternate ID(s):
OSTI ID: 1234297
Journal Information:
Physical Review B, Vol. 93, Issue 4; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (4)

Switchable geometric frustration in an artificial-spin-ice–superconductor heterosystem journal June 2018
Energy dependent structure of Xe ion tracks in YBCO and the effect on the superconductive properties in magnetic fields journal October 2019
Stability of degenerate vortex states and multi-quanta confinement effects in a nanostructured superconductor with Kagome lattice of elongated antidots journal September 2018
Open circuit voltage generated by dragging superconducting vortices with a dynamic pinning potential journal November 2019