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Title: Superconducting Properties in Arrays of Nanostructured β-Gallium

Samples of nanostructured β-Ga wires were synthesized by a novel method of metallic-flux nanonucleation. Several superconducting properties were observed, revealing the stabilization of a weak-coupling type-II-like superconductor (T c≈ 6.2 K) with a Ginzburg-Landau parameter κ GL = 1.18. This contrasts the type-I superconductivity observed for the majority of Ga phases, including small spheres of β-Ga with diameters near 15 μm. Remarkably, our magnetization curves reveal a crossover field H D, where we propose that the Abrikosov vortices are exactly touching their neighbors inside the Ga nanowires. A phenomenological model is proposed to explain this result by assuming that only a single row of vortices is allowed inside a nanowire under perpendicular applied field, with an appreciable depletion of Cooper pair density at the nanowire edges. Lastly, these results are expected to shed light on the growing area of superconductivity in nanostructured materials.
Authors:
 [1] ;  [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [3] ;  [4] ;  [1] ;  [1]
  1. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil). Inst. de Fisica Gleb Wataghin
  2. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil); Univ. Federal de Sergipe (UFS),Sao Cristovao, SE (Brazil). Programa de Pos-Graduacao em Fisica
  3. Univ. of Campinas (UNICAMP), Sao Paulo (Brazil). Inst. de Fisica Gleb Wataghin; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. University of Campinas
Publication Date:
Report Number(s):
LA-UR-17-30509
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396; 2012/04870-7; 2013/21457-9 2015/21290-2; 2015/21289-4; 2013/17427-7; 2010/11949-3
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE
OSTI Identifier:
1431073

Moura, K. O., Pirate, K. R., Beron, F., Jesus, C. B. R., Ferrari Silveira Rosa, Priscila, Tobia, D., Pagliuso, P. G., and Lima, O. F.. Superconducting Properties in Arrays of Nanostructured β-Gallium. United States: N. p., Web. doi:10.1038/s41598-017-15738-2.
Moura, K. O., Pirate, K. R., Beron, F., Jesus, C. B. R., Ferrari Silveira Rosa, Priscila, Tobia, D., Pagliuso, P. G., & Lima, O. F.. Superconducting Properties in Arrays of Nanostructured β-Gallium. United States. doi:10.1038/s41598-017-15738-2.
Moura, K. O., Pirate, K. R., Beron, F., Jesus, C. B. R., Ferrari Silveira Rosa, Priscila, Tobia, D., Pagliuso, P. G., and Lima, O. F.. 2017. "Superconducting Properties in Arrays of Nanostructured β-Gallium". United States. doi:10.1038/s41598-017-15738-2. https://www.osti.gov/servlets/purl/1431073.
@article{osti_1431073,
title = {Superconducting Properties in Arrays of Nanostructured β-Gallium},
author = {Moura, K. O. and Pirate, K. R. and Beron, F. and Jesus, C. B. R. and Ferrari Silveira Rosa, Priscila and Tobia, D. and Pagliuso, P. G. and Lima, O. F.},
abstractNote = {Samples of nanostructured β-Ga wires were synthesized by a novel method of metallic-flux nanonucleation. Several superconducting properties were observed, revealing the stabilization of a weak-coupling type-II-like superconductor (Tc≈ 6.2 K) with a Ginzburg-Landau parameter κGL = 1.18. This contrasts the type-I superconductivity observed for the majority of Ga phases, including small spheres of β-Ga with diameters near 15 μm. Remarkably, our magnetization curves reveal a crossover field HD, where we propose that the Abrikosov vortices are exactly touching their neighbors inside the Ga nanowires. A phenomenological model is proposed to explain this result by assuming that only a single row of vortices is allowed inside a nanowire under perpendicular applied field, with an appreciable depletion of Cooper pair density at the nanowire edges. Lastly, these results are expected to shed light on the growing area of superconductivity in nanostructured materials.},
doi = {10.1038/s41598-017-15738-2},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {11}
}