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Title: Spontaneous formation of superconducting NiBi{sub 3} phase in Ni-Bi bilayer films

We report the spontaneous formation of superconducting NiBi{sub 3} phase in thermally evaporated Ni-Bi bilayer films. High reaction-diffusion coefficient of Bi is believed to drive the formation of NiBi{sub 3} during the deposition of Bi on the Ni film. Cross sectional transmission electron microscopy and glancing incidence X-ray depth profiling confirmed the presence of NiBi{sub 3} throughout the top Bi layer. Superconducting transition at ∼3.9 K, close to the bulk value, was confirmed by transport and magnetization measurements. The bilayers were irradiated with varying fluence of 100 MeV Au ions to study the robustness of superconducting order in presence of large concentration of defects. Superconducting parameters of NiBi{sub 3}, such as transition temperature and upper critical field, remained unchanged upto an ion dose of 1 × 10{sup 14} ions/cm{sup 2}. The diffusive formation of NiBi{sub 3} in Ni opens the possibility of studying superconducting proximity effect at a truly clean superconductor-ferromagnet interface.
Authors:
; ; ;  [1] ;  [2] ; ;  [3]
  1. School of Physical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar, Odisha 751005 (India)
  2. Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064 (India)
  3. Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067 (India)
Publication Date:
OSTI Identifier:
22413155
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BISMUTH; CONCENTRATION RATIO; CRITICAL FIELD; DEPOSITION; DIFFUSION; FILMS; GOLD IONS; INTERFACES; INTERMETALLIC COMPOUNDS; IRRADIATION; LAYERS; MAGNETIZATION; NIOBIUM; PROXIMITY EFFECT; SUPERCONDUCTORS; TRANSITION TEMPERATURE; TRANSMISSION ELECTRON MICROSCOPY; X RADIATION