Origin of resistivity minima at low temperature in ferromagnetic metallic manganites

P. R. Sagdeo; R. J. Choudhary; D. M. Phase

Origin of resistivity minima at low temperature in ferromagnetic metallic manganites

Strongly Correlated Electrons 2008-04-29 v1 Materials Science

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

Abstract

The resistivity and magnetoresistance measurements were carried out on thin film of La0.7Ca0.3MnO3 to investigate the possible origin of low temperature resistivity minimum observed in these samples. We observed large hysteresis in the magnetoresistance at low temperature; 5K and the sample current I has large effect on resistivity minima temperature. The observation of hysteresis at low temperatures suggests the presence of inhomogeneity at low temperatures. These in-homogeneities consist of regions of different resistive phases. It appears that the high resistive phase prevents the tunneling of charge carriers between two low resistive regions and thus giving rise to the resistivity minimum in these samples.

Keywords

resistivity minimum ferromagnetic manganites magnetoresistance hysteresis phase inhomogeneity charge carrier tunneling

Cite

@article{arxiv.0804.4247,
  title  = {Origin of resistivity minima at low temperature in ferromagnetic metallic manganites},
  author = {P. R. Sagdeo and R. J. Choudhary and D. M. Phase},
  journal= {arXiv preprint arXiv:0804.4247},
  year   = {2008}
}

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Figure-3 and figure-4 are important new results

Origin of resistivity minima at low temperature in ferromagnetic metallic manganites

Abstract

Keywords

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