Temperature Dependence of Resistivity of $Sr_2CoMoO_{6-δ}$ Films

Details Temperature Dependence of Resistivity of $Sr_2CoMoO_{6-δ}$ Films Temperature Dependence of Resistivity of $Sr_2CoMoO_{6-δ}$ Films

2003-07-22

arxiv.org/abs/cond-mat/0307527v2

Physics

Condensed Matter

Materials Science

Scientific paper

We investigate the temperature dependence of the resistivity and magnetoresistance of a polycrystalline $Sr_2CoMoO_{6-\delta}$ film deposited on (100)-$SrTiO_3$ substrate prepared by the pulsed laser deposition method. X-ray diffraction, Raman and magnetoresistance results demonstrate clearly the coexistence of a ferromagnetic metallic and an antiferromagnetic (or paramagnetic) insulating domain. Percolative transition between these two phases as the temperature varies, which is believed to induce a metal-insulator transition at around $T_C$, has been directly observed in our measurements of the temperature dependence of the sample resistivity. Thus we have provided new direct evidence that a phase separation scenario also exists in the ordered double-perovskite structure materials.

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