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Title: Crossing fields in thin films of isotropic superconductors

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.
 [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:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 18; Journal ID: ISSN 2469-9950
American Physical Society (APS)
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)
Country of Publication:
United States