M. Lagues et al., ROOM-TEMPERATURE TRANSPORT-PROPERTIES OF NEW BISRCACUO COMPOUNDS, Comptes rendus de l'Academie des sciences. Serie II. Mecanique, physique, chimie, astronomie, 324(10), 1997, pp. 627-639
New compounds belonging to the BiSrCaCuO cuprate family have been synt
hesized by sequentially imposed layer epitaxy. The Cu/Ca ratio in thes
e compounds is typically twice the value for conventional Bi2Sr2Can-1C
unO2n+4. A second characteristic of the new compounds is a Bi deficien
cy relative to conventional BSCCO. The room temperature electrical res
istivity of these compounds reaches extremely low values, orders of ma
gnitude below that of copper. Strongly non-linear I(V) characteristics
of various forms are observed. Typical examples are described where t
he Voltage dependence at the onset of measurable dissipation is either
exponential or parabolic as a function of current intensity. Examples
are also presented where I(V) exhibits an hysteretic behavior.