Anomalous Hall effect in L 1 0 − MnAl films with controllable orbital two-channel Kondo effect
Physical Review B(2016)
摘要
The anomalous Hall effect (AHE) in strongly disordered magnetic systems has been buried in persistent confusion despite its long history. We report the AHE in perpendicularly magnetized $L{1}_{0}\text{\ensuremath{-}}\mathrm{MnAl}$ epitaxial films with a variable orbital two-channel Kondo (2CK) effect arising from the strong coupling of conduction electrons and the structural disorders of two-level systems. The AHE is observed to excellently scale with ${\ensuremath{\rho}}_{\mathrm{AH}}/f={a}_{0}{\ensuremath{\rho}}_{xx0}+b{\ensuremath{\rho}}_{xx}^{2}$ at high temperatures where phonon scattering prevails. In contrast, significant deviation occurs at low temperatures where the orbital 2CK effect becomes important, suggesting a negative AHE contribution. The deviation of the scaling agrees with the orbital 2CK effect in the breakdown temperatures and deviation magnitudes.
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关键词
anomalous hall effect,hall effect,two-channel
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