Abstract
We have measured the in-plane magnetoresistivity, p(T,H), of YBa 2Cu 3O 7 − δ, Bi 2Sr 2Ca-Cu 2O 8 and TI 2Ba 2Ca 2Cu 3O 10 crystals with small stoichiometric inhomogeneities at long length scales and uniformly and non-uniformly distributed in the crystals. These stoichiometric inhomogeneities (mainly of the oxygen content) lead to T c inhomogeneities, which deform the p(T,H) curves mainly near T c. In the case of non-uniformly distributed inhomogeneities, sharp p(T,H) peaks may also appear, very sensitive to the applied magnetic field. This leads to a very anisotropic and negative magnetoresistivity. We will show that these different effects may be explained at a quantitative level in terms of temperature dependent electrical current redistributions.
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