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Anomalous resistivity upturn in epitaxial L21-Co2MnAl films.


ABSTRACT: Despite of the great scientific and technology interest, highly ordered full-Heusler L21-Co2MnAl films have remained a big challenge in terms of the availability and the electrical transport. Here we report the controllable growth and the intriguing transport behavior of epitaxial L21-Co2MnAl films, which exhibit a low-temperature (T) resistivity upturn with a pronounced T1/2 dependence, a robust independence of magnetic fields, and a close relevance to structural disorder. 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 origin of the resistivity upturn.

SUBMITTER: Zhu LJ 

PROVIDER: S-EPMC5317171 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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Anomalous resistivity upturn in epitaxial L2<sub>1</sub>-Co<sub>2</sub>MnAl films.

Zhu L J LJ   Zhao J H JH  

Scientific reports 20170220


Despite of the great scientific and technology interest, highly ordered full-Heusler L2<sub>1</sub>-Co<sub>2</sub>MnAl films have remained a big challenge in terms of the availability and the electrical transport. Here we report the controllable growth and the intriguing transport behavior of epitaxial L2<sub>1</sub>-Co<sub>2</sub>MnAl films, which exhibit a low-temperature (T) resistivity upturn with a pronounced T<sup>1/2</sup> dependence, a robust independence of magnetic fields, and a close  ...[more]

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