Excess conduction of YBaCuO point contacts between 100 and 200 K

L. F. Rybal'chenko; I. K. Yanson; N. L. Bobrov; V. V. Fisun; M. A. Obolenskii; A. V. Bondarenko; Yu. D. Tret'yakov; A. R. Kaul'; I. E. Graboi

Excess conduction of YBaCuO point contacts between 100 and 200 K

Superconductivity 2017-01-24 v1

Authors: L. F. Rybal'chenko , I. K. Yanson , N. L. Bobrov , V. V. Fisun , M. A. Obolenskii , A. V. Bondarenko , Yu. D. Tret'yakov , A. R. Kaul' , I. E. Graboi

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Abstract

$YBaCuO-Ag$ 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 $YBaCuO$ .

Keywords

YBaCuO point contacts excess conductivity fluctuational pairing superconductivity two-dimensional superconductivity unknown phase high-temperature superconductors

Cite

@article{arxiv.1701.06035,
  title  = {Excess conduction of YBaCuO point contacts between 100 and 200 K},
  author = {L. F. Rybal'chenko and I. K. Yanson and N. L. Bobrov and V. V. Fisun and M. A. Obolenskii and A. V. Bondarenko and Yu. D. Tret'yakov and A. R. Kaul' and I. E. Graboi},
  journal= {arXiv preprint arXiv:1701.06035},
  year   = {2017}
}

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5 pages, 5 figures

Excess conduction of YBaCuO point contacts between 100 and 200 K

Abstract

Keywords

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