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Title: Tunneling Spectroscopy of Superconducting MoN and NbTiN Grown by Atomic Layer Deposition.

Journal Article · · Applied Physics Letters
DOI: https://doi.org/10.1063/1.4867880 · OSTI ID:1357490
 [1];  [1];  [2];  [3];  [1];  [2];  [2];  [1];  [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Illinois Inst. of Technology, Chicago, IL (United States)
  3. Inonu Univ., Malatya (Turkey)

A tunneling spectroscopy study is presented of superconducting MoN and Nbo.8Tio.2N thin films grown by atomic layer deposition (ALD). The films exhibited a superconducting gap of 2meV and 2.4meV, respectively, with a corresponding critical temperature of 11.5K and 13.4 K, among the highest reported Tc values achieved by the ALD technique.Tunnel junctions were obtained using a mechanical contact method with a Au tip. While the native oxides of these films provided poor tunnel barriers, high quality tunnel junctions with low zero bias conductance (below rvl0%) were obtained using an artificial tunnel barrier of Ah03 on the film's surface grown ex situ by ALD. We find a large critical current density on the order of 4 x 106Ncm2 at T =0.8Tc for a 60 run MoN film and demonstrate conformal coating capabilities of ALD onto high aspect ratio geometries. These results suggest that the ALD technique offers significant promise for thin film superconducting device applications.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1357490
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 104; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (19)

Nitrides of titanium, niobium, tantalum and molybdenum grown as thin films by the atomic layer epitaxy method journal December 1988
Point contact tunnelling apparatus with temperature and magnetic field control journal September 1998
Superconducting molybdenum nitride epitaxial thin films deposited on MgO and α-Al2O3 substrates by molecular beam epitaxy journal December 2006
Synthesis and characterisation of hexagonal molybdenum nitrides journal August 2006
Low-Temperature Al2O3 Atomic Layer Deposition journal February 2004
Epitaxial Superconducting δ-MoN Films Grown by a Chemical Solution Method journal December 2011
Atomic Layer Deposition and Superconducting Properties of NbSi Films journal April 2011
Viscous flow reactor with quartz crystal microbalance for thin film growth by atomic layer deposition journal August 2002
Surface chemistry of atomic layer deposition: A case study for the trimethylaluminum/water process journal June 2005
Improvement and protection of niobium surface superconductivity by atomic layer deposition and heat treatment journal November 2008
Properties of NbN thin films deposited on ambient temperature substrates journal November 1983
High T c superconducting NbN films deposited at room temperature journal December 1985
Superconductive tunneling into NbN deposited near room temperature journal October 1982
Superconducting tunneling study of vanadium journal February 1982
Superconductivity of B1 -MoN films annealed under high pressure journal August 1985
Critical current across grain boundaries in melt-textured YBa 2 Cu 3 O 7 − δ rings journal September 2001
Structural distortion and suppression of superconductivity in stoichiometric B 1 − MoN epitaxial thin films journal February 2006
Direct Measurement of Quasiparticle-Lifetime Broadening in a Strong-Coupled Superconductor journal November 1978
Superconducting transition metal nitride films for THz SIS mixers journal March 2001

Cited By (1)

First complex oxide superconductor by atomic layer deposition journal January 2018