Superconducting Density of States in B-Doped Diamond
O. Onufriienkoa,b, T. Samuelya,b, G. Zhang c, J. Vanacken c, Zheng Xu d, P.W. May e, P. Szabóa,b, V.V. Moshchalkov c and P. Samuelya,b
aCentre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
bFaculty of Science, P.J. Šafárik University, 040 01 Košice, Slovakia
cINPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Belgium
d School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85281, USA
eSchool of Chemistry, University of Bristol, Bristol BS8 1TS, UK
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In the presented work, we investigated the superconducting boron doped diamond polycrystalline film prepared by chemical vapor deposition by means of scanning tunneling microscopy/spectroscopy. Differential conductance spectra measured at various temperatures were used to obtain the values of superconducting critical temperature and energy gap. Comparing various theoretical models fitted to the differential conductance spectra measured at 0.5 K suggests weak pair breaking. However, this cannot account for the high 2Δ/kBTC ratio, which therefore indicates strong coupling.

DOI: 10.12693/APhysPolA.131.1033
PACS numbers: 74.70.Wz, 74.62.En, 74.55.+v