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We report the controllable growth and the intriguing transport behavior ofhigh-spin-polarization epitaxial L21-Co2MnAl films, which exhibit alow-temperature (T) resistivity upturn with pronounced T1/2 dependence, closerelevance to structural disorder, and robust independence of magnetic fields.The resistivity upturn turns out to be qualitatively contradictory to weaklocalization, particle-particle channel electron-electron interaction (EEI),and orbital two-channel Kondo effect, leaving a three-dimensional particle-holechannel EEI the most likely physical source. Our result highlights aconsiderable tunability of the structural and electronic disorder of magneticfilms by varying growth temperature, affording unprecedented insights into thespin polarization and the resistivity upturn.

Anomalous resistivity upturn in epitaxial L21-Co2MnAl films