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Title: Intrinsic granularity in nanocrystalline boron-doped diamond films measured by scanning tunneling microscopy
Authors: Willems, B. L.
Dao, V. H.
Vanacken, J.
Chibotaru, L. F.
Moshchalkov, V. V.
Guillamon, I.
Suderow, H.
Vieira, S.
JANSSENS, Stoffel 
WAGNER, Patrick 
Issue Date: 2009
Source: PHYSICAL REVIEW B, 80(22)
Abstract: We report on low-temperature scanning tunneling microscopy/spectroscopy experiments performed on superconducting boron-doped nanocrystalline diamond (NCD) thin films prepared by chemical-vapor deposition methods. The most representative sample reveals the observed superconducting gap (Delta) highly modulated over a length scale on the order of similar to 30 nm, which is much shorter than the typical diamond grain size. The sample local and macroscopic behavior favors for the Delta modulation as being an intrinsic property of the NCD granules. On the other hand, Delta shows its temperature dependence [Delta(T)] consistent with the results obtained by Fominov and Feigel'man [Phys. Rev. B 63, 094518 (2001)], who studied theoretically the behavior of the superconducting gap of a BCS superconductor in contact with a normal layer by solving the one-dimensional Usadel equations on the superconducting side of the superconducting to normal interface.
Notes: [Willems, B. L.; Vanacken, J.; Moshchalkov, V. V.] Katholieke Univ Leuven, INPAC, Nanoscale Superconduct & Magnetism & Pulsed Field, B-3001 Louvain, Belgium. [Willems, B. L.] Univ Nacl Mayor San Marcos, Fac Ciencias Fis, Lima 14, Peru. [Dao, V. H.; Chibotaru, L. F.] Univ Louvain, Div Quantum & Phys Chem, B-3001 Louvain, Belgium. [Dao, V. H.; Chibotaru, L. F.] Univ Louvain, INPAC, B-3001 Louvain, Belgium. [Janssens, S. D.; Williams, O. A.; Haenen, K.; Wagner, P.] Hasselt Univ, Inst Mat Res, BE-3590 Diepenbeek, Belgium. [Guillamon, I.; Suderow, H.; Vieira, S.] Univ Autonoma Madrid, Fac Ciencias, Dept Fis Mat Condensada, Inst Ciencia Mat Nicolas Cabrera,Lab Bajas Temp, E-28049 Madrid, Spain. [Williams, O. A.; Haenen, K.; Wagner, P.] IMEC VZW, Div IMOMEC, BE-3590 Diepenbeek, Belgium.
Keywords: boron; diamond; magnetic moments; nanostructured materials; plasma CVD; scanning tunnelling microscopy; scanning tunnelling spectroscopy; superconducting energy gap; superconducting thin films
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ISSN: 1098-0121
DOI: 10.1103/PhysRevB.80.224518
ISI #: 000273228500092
Category: A1
Type: Journal Contribution
Validations: ecoom 2011
Appears in Collections:Research publications

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