title: Orbital two-channel Kondo effect in epitaxial ferromagnetic L1(0)-MnAl films.
abstract: The orbital two-channel Kondo effect displaying exotic non-Fermi liquid behaviour arises in the intricate scenario of two conduction electrons compensating a pseudo-spin-1/2 impurity of two-level system. Despite extensive efforts for several decades, no material system has been clearly identified to exhibit all three transport regimes characteristic of the two-channel Kondo effect in the same sample, leaving the interpretation of the experimental results a subject of debate. Here we present a transport study suggestive of a robust orbital two-channel Kondo effect in epitaxial ferromagnetic L1(0)-MnAl films, as evidenced by a magnetic field-independent resistivity upturn with a clear transition from logarithmic- to square-root temperature dependence and deviation from it in three distinct temperature regimes. Our results also provide an experimental indication of the presence of two-channel Kondo physics in a ferromagnet, pointing to considerable robustness of the orbital two-channel Kondo effect even in the presence of spin polarization of the conduction electrons.
authors.affiliation: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083, China.|Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, von-Danckelmann-Platz 3, Halle 06120, Germany.
authors.forename: L J
authors.initials: LJ
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083, China.
authors.forename: S H
authors.initials: SH
authors.lastname: Nie
authors.affiliation: Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: P
authors.initials: P
authors.lastname: Xiong
authors.affiliation: Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: P
authors.initials: P
authors.lastname: Schlottmann
authors.affiliation: State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, PO Box 912, Beijing 100083, China.
authors.forename: J H
authors.initials: JH
authors.lastname: Zhao