Transport and tunneling studies on single crystals of YBa2Cu3O7

Nai Phuan Ong, Z. Z. Wang, S. Hagen, T. W. Jing, J. Clayhold, J. Horvath

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Abstract

Using a flux technique we have grown crystals of YBa2Cu3O7 which are superconducting above 90 K as-grown. In 10% of these crystals large orthorhombic single domains exceeding 100×100 μm2 are observed using polarised light. The conductivity anisotropy (≈100 at 290 K to ≈300 near Tc) indicates a strikingly two-dimensional electronic state. Anisotropy in the thermopower is also reported. Tunneling into these crystals provides direct evidence that the electronic spectrum is different from the BCS spectrum. A (possibly) novel spin-dependent gap which scales linearly with field is described. Finally, paraconductivity studies on crystals with transition widths δT ≈ 0.2 K are summarised.

Original languageEnglish (US)
Pages (from-to)1072-1077
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume153-155
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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