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Title: Crossing fields in thin films of isotropic superconductors

Abstract

We study interactions of perpendicular and longitudinal magnetic fields in niobium films of different thickness in a wide range of temperatures below the superconducting transition temperature ( T C) . In 100 nm Nb film at all temperatures the longitudinal field H || practically does not influence the dynamics of the normal flux. However, in 200nm Nb film, a considerable anisotropy in the vortex motion is found with advanced propagation of the normal flux along H || at T>TC/2 and the preferential jump-wise growth of the thermo-magnetic flux dendrites across H || at T < T C. Appearance of the in-plane vortices and their cutting-reconnection with tilted vortices induced by the normal field H || is the reason of the observed anisotropy in the thicker film. Absence of the in-plane vortices and much smaller tilt of vortices generated by H || explain the isotropic normal flux dynamics in the thinner film. Lastly, our results open a new way of manipulating both slow vortex motion and fast thermo-magnetic avalanches.

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. Federal de Sao Carlos, Sao Carlos (Brazil)
  3. Univ. Bordeaux, Talence Cedex (France)
  4. Univ. Federal de Sao Carlos, Sao Carlos (Brazil)
  5. Univ. Federal do Rio Grande do Sul, Porto Alegre (Brazil)
  6. Ciencia e Tecnologia de Sao Paulo, Sao Paulo (Brazil)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Materials Sciences and Engineering Division; Sao Paulo Research Foundation (FAPESP)
OSTI Identifier:
1353037
Alternate Identifier(s):
OSTI ID: 1331019
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Vlasko-Vlasov, V. K., Colauto, Fabiano, Buzdin, Alexander A., Carmo, D., Andrade, A. M. H., Oliveira, A. A. M., Ortiz, W. A., Rosenmann, D., and Kwok, W. -K. Crossing fields in thin films of isotropic superconductors. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.184502.
Vlasko-Vlasov, V. K., Colauto, Fabiano, Buzdin, Alexander A., Carmo, D., Andrade, A. M. H., Oliveira, A. A. M., Ortiz, W. A., Rosenmann, D., & Kwok, W. -K. Crossing fields in thin films of isotropic superconductors. United States. doi:10.1103/PhysRevB.94.184502.
Vlasko-Vlasov, V. K., Colauto, Fabiano, Buzdin, Alexander A., Carmo, D., Andrade, A. M. H., Oliveira, A. A. M., Ortiz, W. A., Rosenmann, D., and Kwok, W. -K. Fri . "Crossing fields in thin films of isotropic superconductors". United States. doi:10.1103/PhysRevB.94.184502. https://www.osti.gov/servlets/purl/1353037.
@article{osti_1353037,
title = {Crossing fields in thin films of isotropic superconductors},
author = {Vlasko-Vlasov, V. K. and Colauto, Fabiano and Buzdin, Alexander A. and Carmo, D. and Andrade, A. M. H. and Oliveira, A. A. M. and Ortiz, W. A. and Rosenmann, D. and Kwok, W. -K.},
abstractNote = {We study interactions of perpendicular and longitudinal magnetic fields in niobium films of different thickness in a wide range of temperatures below the superconducting transition temperature (TC) . In 100 nm Nb film at all temperatures the longitudinal field H|| practically does not influence the dynamics of the normal flux. However, in 200nm Nb film, a considerable anisotropy in the vortex motion is found with advanced propagation of the normal flux along H|| at T>TC/2 and the preferential jump-wise growth of the thermo-magnetic flux dendrites across H|| at T < TC. Appearance of the in-plane vortices and their cutting-reconnection with tilted vortices induced by the normal field H|| is the reason of the observed anisotropy in the thicker film. Absence of the in-plane vortices and much smaller tilt of vortices generated by H|| explain the isotropic normal flux dynamics in the thinner film. Lastly, our results open a new way of manipulating both slow vortex motion and fast thermo-magnetic avalanches.},
doi = {10.1103/PhysRevB.94.184502},
journal = {Physical Review B},
number = 18,
volume = 94,
place = {United States},
year = {2016},
month = {11}
}

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Works referenced in this record:

Flux jumps in type II superconductors
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Boundaries of the instability region on the HT diagram of Nb thin films
journal, March 2008


Magnetic field imaging of curved vortex lines in thin films of anisotropic superconductors
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Critical state stability in type-II superconductors and superconducting-normal-metal composites
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Nonlinear current flow in superconductors with restricted geometries
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Tilted and curved vortices in anisotropic superconducting films
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