We report the controllable growth and the intriguing transport behavior of high-spin-polarization epitaxial L21-Co2MnAl films, which exhibit a low-temperature (T) resistivity upturn with pronounced T1/2 dependence, close relevance to structural disorder, and robust independence of magnetic fields. The resistivity upturn turns out to be qualitatively contradictory to weak localization, particle-particle channel electron-electron interaction (EEI), and orbital two-channel Kondo effect, leaving a three-dimensional particle-hole channel EEI the most likely physical source. Our result highlights a considerable tunability of the structural and electronic disorder of magnetic films by varying growth temperature, affording unprecedented insights into the spin polarization and the resistivity upturn.
@article{arxiv.1611.04013,
title = {Anomalous resistivity upturn in epitaxial L21-Co2MnAl films},
author = {L. J. Zhu and J. H. Zhao},
journal= {arXiv preprint arXiv:1611.04013},
year = {2017}
}