Low-temperature resistivity anomaly and weak spin disorder in Co2MnGa epitaxial thin films
Author(s): Tong, SC (Tong, Shucheng); Zhao, XP (Zhao, Xupeng); Wei, DH (Wei, Dahai); Zhao, JH (Zhao, Jianhua)
Source: PHYSICAL REVIEW B Volume: 101 Issue: 18 Article Number: 184434 DOI: 10.1103/PhysRevB.101.184434 Published: MAY 29 2020
Abstract: The topological material of Co2MnGa with potentially high spin polarization has attracted more and more attention, in the fields of fundamental science and spintronic applications. Here we report the electrical- and magnetotransport behaviors in epitaxial Co2MnGa thin films. An angle-independent negative linear magnetoresistance and a negative anisotropy magnetoresistance are observed in the whole temperature range from 3 to 300 K, indicating the existence of weak spin disorder and a high spin polarization. Intriguingly, with decreasing temperature an anomalous resistivity upturn that exhibits -T-1/2 dependence is observed, and this phenomenon is robust under magnetic fields. Further analysis demonstrates that the three-dimensional enhanced electron-electron interaction effect is responsible for these phenomena rather than the orbital two-channel Kondo effect or other quantum interference effects, which provides deeper insight into the transport behavior of the Co2MnGa materials.
Accession Number: WOS:000536401900002