We report precise measurements and quantitative data analysis on the low-temperature resistivity of several ferromagnetic manganite films. We clearly show that there exists a T^{4.5} term in low-temperature resistivity, and that this term is in quantitative agreement with the quantum theory of two-magnon scattering for half metallic ferromagnets. Our present results provide the first bulk experimental evidence of half-metallic ferromagnetism in doped manganites.
@article{arxiv.cond-mat/0008151,
title = {Bulk experimental evidence of half-metallic ferromagnetism in doped manganites},
author = {Guo-meng Zhao and H. Keller},
journal= {arXiv preprint arXiv:cond-mat/0008151},
year = {2009}
}