Anomalous Hall effect in L1(0)-MnAl films with controllable orbital two-channel Kondo effect

作者：Zhu, L. J.^*; Nie, S. H.; Zhao, J. H.^*

来源：Physical Review B, 2016, 93(19): 195112.

DOI：10.1103/PhysRevB.93.195112

• SIDE-JUMP MECHANISM
• ANISOTROPY
• ALLOYS
• FIELD

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 L1(0)-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 rho(AH)/f = a(0)rho(xx0) + b rho(2)(xx) 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.

• 出版日期2016-5-6
• 单位半导体超晶格国家重点实验室; 中国科学院