Nonlinear conductivity of electronic origin in self-doped LaMnO3+δ

Fisher, B.; Genossar, J.; Patlagan, L.; Reisner, G. M.
September 2009
Applied Physics Letters;9/28/2009, Vol. 95 Issue 13, p132501
Academic Journal
We report on electronic transport measurements on polycrystalline, nonmetallic samples of LaMnO3+δ, in the Ohmic and non-Ohmic regimes. The non-Ohmic regime has been investigated using single current pulses of short duration. The large nonlinearity of the pulsed I-V characteristics is probably of the same origin as that of the nonmetallicity of LaMnO3+δ, that is, disorder introduced by Mn vacancies. The dc I-V characteristics, under similar fields, show much larger nonlinearity and hysteresis, typical of self-heating in samples with activated conductivity.


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