Excess conduction of YBaCuO point contacts between 100 and 200 K
L. F. Rybal’chenkoPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1I. K. YansonPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1N. I. BobrovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1V. V. FisunPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1M. A. Obolenskiı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov 1A. V. BondarenkoA. M. Gorky State University, Kharkov 2Yu. D. Tret’yakovA. R. KaulI. É. Graboǐ
ABI
Аннотация
YBaCuO–Ag pressure point contacts with direct conduction are investigated. The excess (relative to the normal state) conductivity mainly caused by fluctuational pairing of electrons above Tc is measured in the temperature interval 100–200 K. The superconductivity above 120 K is found to be of the two-dimensional type. The obtained preliminary results indicate the presence of small amount of an unknown phase with T′c ≳ 200 Kin YBaCuO.
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