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Title: Interwoven magnetic and flux line structures in single crystal (Tm,Er)Ni{sub 2}B{sub 2}C (invited)

We review studies of the interactions between magnetic order and the flux line lattice (FLL) in the (RE)Ni{sub 2}B{sub 2}C intermetallic borocarbides for (RE)=Tm and Er using small angle neutron scattering (SANS) and magneto-transport. For (RE)=Tm the magnetic order and the FLL assume a common symmetry, sharing a phase transition at {approx}2 kOe, despite an order of magnitude difference in periodicity. For (RE)=Er, the penetration depth {lambda} and the coherence length {xi}, both of which are derived from the FLL form factor, are modified near T{sub N}=6 K by a theoretically predicted weakly divergent pairbreaking. Finally, below 2.3 K, (RE)=Er shows a coexistence of weak ferromagnetism and superconductivity. This state reveals a highly disordered FLL and a striking increase in the critical current, both arising from the strong ferromagnetic pairbreaking. (c) 2000 American Institute of Physics.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3]
  1. Bell Laboratories, Lucent Technologies, 700 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)
  2. Risoe National Laboratories, DK-4000, Roskilde, (Denmark)
  3. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
Publication Date:
OSTI Identifier:
20216241
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THULIUM COMPOUNDS; ERBIUM COMPOUNDS; NICKEL COMPOUNDS; BORIDES; CARBIDES; MAGNETIC FLUX; SUPERCONDUCTORS; INTERMETALLIC COMPOUNDS; PENETRATION DEPTH; NEUTRON DIFFRACTION