Peak resistance temperature and low temperature resistivity in thin film $L{a}_{1-x}C{a}_{x}Mn{O}_3$ mixtures for x <= 1/3

Abstract

The electrical resistivity of La${}_{1-x}$Ca${}_x$MnO${}_3$ thin films grown on (001) NdGaO${}_3$ and (100) SrTiO${}_3$ substrates by off-axis sputtering has been studied as a function of the Calcium doping level. The samples have very narrow rocking curves and excellent in plane registry with the substrate. A strong correlation between the peak resistance temperature and the polaronic hopping energy is seen which is not simply linear. The low temperature resistivity is seen to be fit better by a model of single magnon scattering, and a near linear correlation between the resistivity due to magnon scattering and static impurities is observed.

12 pages, 7 figures