Current–voltage characteristics and energy gap in high-temperature YBaCuO compounds
V. M. DmitrievPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. L. Solov’evPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. I. DmitrenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
Point contacts formed by metal (steel, niobium) and high-temperature superconductors (HTS) YBaCuOx are investigated in the temperature range from the helium temperature to Tc≃70 K. The magnitude (Δ(0)∼17 MeV, 2 Δ(0)/kTc≃5.5) and the temperature dependence of the energy gap are determined; it is found that they match with the values predicted by the BCS theory in the strong-bond limit. The discovered peaks on the dV/dI (V) dependence, which weakly depend on temperature, point towards the strong electron-phonon interaction in HTS. The effects associated with a change in conductivity of HTS upon a transition through Tc are considered.
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