Rectifying properties of the YBa2Cu3O7− /SrTiO3:Nb heterojunction
نویسندگان
چکیده
A heterojunction has been fabricated by growing a YBa2Cu3O7− YBCO film of the thickness of 1000 Å on a 0.5 wt %Nb-doped SrTiO3 STON crystal, and its resistive behavior was experimentally studied. The strong asymmetry of the current-voltage I–V relation with respect to bias polarity indicates an excellent rectifying property of the junction in the whole temperature range studied. The superconducting transition of YBCO causes a visible reduction of diffusion potential, measured by the forward voltage corresponding to the current rush in the I–V curves, though the general rectifying behavior remains unchanged. This is possibly a result of the variation of the Fermi level of YBCO relative to that of STON, and suggests an alternative technique detecting the effects of superconducting transition in YBCO. © 2005 American Institute of Physics. DOI: 10.1063/1.2136407
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