Abstract
The behavior of the electrical resistivity ρ(T), the superconducting transition temperature T c , and the upper critical field H c2(T) of a polycrystalline sample of YNi2B2C irradiated by thermal neutrons with the subsequent high-temperature isochronous annealing in the temperature interval T ann = 100–1000°C has been studied. It has been found that the irradiation of YNi2B2C with a fluence of 1019cm−2 leads to the suppression of the superconductivity. The final disordered state is reversible; i.e., the initial ρ(T), T c , and H c2(T) values are almost completely recovered upon annealing at up to T ann = 1000°C. The quadratic dependence ρ(T) = ρ0 + a 2 T 2 is observed for the sample in the superconducting state (T c = 5.5−14.5 K). The coefficient a 2 (proportional to the square of the electron mass m*) hardly changes. The form of the dependence of T c on ρ0 can be interpreted as the suppression of the two superconducting gaps, Δ1 and Δ2 (Δ1 ∼ 2Δ2). The degradation rate of Δ1 is about three times higher than that of Δ2. The dependences dH c2/dT on ρ0 and T c may be described by the relations for a superconductor in the intermediate limit (the coherence length ζ0 is on the order of the electron mean free path l tr) under the assumption of a nearly constant electron density of states on the Fermi level N(E F). The observed behavior of T c obviously does not agree with the widespread opinion about the purely electron-phonon mechanism of superconductivity in the compounds of this type supposing the anomalous type of superconducting pairing.
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Original Russian Text © A.E. Karkin, Yu.N. Akshentsev, B.N. Goshchitskii, 2013, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2013, Vol. 97, No. 6, pp. 392–397.
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Karkin, A.E., Akshentsev, Y.N. & Goshchitskii, B.N. Suppression of superconductivity in YNi2B2C at the atomic disordering. Jetp Lett. 97, 347–351 (2013). https://doi.org/10.1134/S0021364013060076
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DOI: https://doi.org/10.1134/S0021364013060076