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Distribution of the superconducting gap in a YNi2B2C film studied by point contact spectroscopy

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The differential resistances Rd = d V/d I(V) of point contacts between a normal metal and a c axis oriented YNi2B2C film (Tc = 15.2 K) in the superconducting (SC) state have been investigated. Rd(V) contains clear 'gap' features connected with processes of Andreev reflection at the boundary between a normal metal and a superconductor that allow the determination of the SC gap Δ and its temperature and magnetic field dependence. A distribution of Δ from Δmin≈1.5 meV to Δmax≈2.4 meV is revealed; however, the critical temperature Tc in all cases corresponded to that of the film. The value 2Δmax/kBTc≈3.66 is close to the Bardeen–Cooper–Schrieffer (BCS) value of 3.52, and the temperature dependence Δ(T) is BCS-like, irrespective of the actual Δ value. It is supposed that the distribution of Δ can be attributed to a gap anisotropy or to a multiband nature of the SC state in YNi2B2C, rather than to the presence of nodes in the gap.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/18/8/012

Publication date: August 1, 2005

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