We investigate the temperature dependence of the resistivity and magnetoresistance of a polycrystalline Sr2CoMoO6−δ film deposited on (100)-SrTiO3 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 TC, 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.
@article{arxiv.cond-mat/0307527,
title = {Temperature Dependence of Resistivity of $Sr_2CoMoO_{6-\delta}$ Films},
author = {C. L. Yuan and Z. Y. Zeng and Y. Zhu and P. P. Ong and Z. X. Shen and C. K. Ong},
journal= {arXiv preprint arXiv:cond-mat/0307527},
year = {2007}
}