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Abstract: The resistivity and magnetoresistance measurements were carried out on thinfilm of La0.7Ca0.3MnO3 to investigate the possible origin of low temperatureresistivity minimum observed in these samples. We observed large hysteresis inthe magnetoresistance at low temperature; 5K and the sample current I has largeeffect on resistivity minima temperature. The observation of hysteresis at lowtemperatures suggests the presence of inhomogeneity at low temperatures. Thesein-homogeneities consist of regions of different resistive phases. It appearsthat the high resistive phase prevents the tunneling of charge carriers betweentwo low resistive regions and thus giving rise to the resistivity minimum inthese samples.



Author: P.R. Sagdeo, R.J. Choudhary, D.M. Phase

Source: https://arxiv.org/







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