Excess conduction of YBaCuO point contacts between 100 and 200 K
L. F. Rybal’chenkoKharkiv University of Humanities People’s Ukrainian AcademyI. K. YansonPhysicotechnical Institute of Low Temperatures ,Nikolai L. BobrovPhysicotechnical Institute of Low Temperatures ,V. V. FisunPhysicotechnical Institute of Low Temperatures ,M. A. Obolenskiı̆A. V. BondarenkoYu. D. Tret’yakovA. R. KaulPhysicotechnical Institute of Low Temperatures ,I. É. GraboǐPhysicotechnical Institute of Low Temperatures ,
2017en
ABI
Annotatsiya
$YBaCuO-Ag$ pressure point contacts with direct conduction are investigated. The excess (relative to the normal state) conductivity mainly caused by fluctuational pairing of electrons above $T_c$ 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 $T'_c\gtrsim 200~K$ in $YBaCuO$.
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