Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session R49: Superconducting Proximity Effect and Josephson Junctions IV
8:00 AM–10:36 AM,
Thursday, March 5, 2020
Room: Mile High Ballroom 1B
Sponsoring
Unit:
DCMP
Chair: Thomas Bullard, UES, Inc.
Abstract: R49.00012 : Low Temperature Annealing and the Generation of Superconductivity in Nickel-Bismuth Bilayers*
Presenter:
Gavin Burnell
(Univ of Leeds)
Authors:
Matthew Vaughan
(Univ of Leeds)
Nathan Satchell
(Univ of Leeds)
Mannan Ali
(Univ of Leeds)
Christy Kinane
(ISIS Neutron and Muon Source, Rutherford-Appleton Laboratory)
Gavin Stenning
(ISIS Neutron and Muon Source, Rutherford-Appleton Laboratory)
Sean Langridge
(ISIS Neutron and Muon Source, Rutherford-Appleton Laboratory)
Gavin Burnell
(Univ of Leeds)
We perform structural characterization with X-ray diffraction and spin polarized neutron reflectometry, and measure magnetisation and low temperature electron transport for samples annealed at 70○ C. We show that the onset of superconductivity in our samples is coincident with the formation of ordered NiBi3 intermetallic alloy, known to be an s-wave superconductor. We find that the annealing process has a rather low activation energy of (0:86±0:06) eV. Gentle heating as typical for cleanroom processing will result in NiBi3 formation which poses a challenge for studying distinct Bi/Ni interface behaviour.
*We acknowledge support from the UK STFC ISIS neutron and muon source (RB 1920455). The work was also supported financially by the UK EPSRC DTP and EP/M000923/1 and from the EU H2020 Marie Sk lodowska-Curie Grant Agreement No. 743791 (SUPERSPIN).
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