Anomalous Hall effect of Nd 0.7 Sr 0.3 MnO 3 films with large magnetoresistance ratio: Evidence of Berry phase effect
Anomalous Hall effect of Nd 0.7 Sr 0.3 MnO 3 films with large magnetoresistance ratio: Evidence of Berry phase effect
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DOI：
10.1103/physrevb.64.174415
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发表时间：
2001-10
影响因子：
3.7
通讯作者：
Hong-Chang Yang;Li-Min Wang;H. Horng
中科院分区：
文献类型：
--
作者：
Hong-Chang Yang;Li-Min Wang;H. Horng
测量了具有大磁阻的[110]和[100]取向外延Nd 0.7 Sr 0.3 MnO 3 薄膜的横向霍尔电阻率ρ xy 和磁化强度M，作为温度和外加磁场的函数，以研究普通霍尔系数和自发霍尔系数。在铁磁状态下，100 K< T< 200 K，(− R s/R o)× T 与 exp (− E c/k B T) 成正比，其中 R s 是自发霍尔系数，Ro 是普通霍尔系数，E c 是磁偶极子的核心能量。此外，在低温状态（T< 160 K）中，R s 与 ρ xx 2 成正比，其中普通霍尔系数 Ro 与温度无关。在高温 (T> 160 K) 下观察到结垢行为 R s∝ ρ xx。 [110] 和 [100] 取向薄膜的霍尔效应相互比较。根据现有理论对结果进行了讨论。
The transverse Hall resistivity, ρ xy, and magnetization, M, of [110] and [100] oriented epitaxial Nd 0.7 Sr 0.3 MnO 3 films with large magnetoresistance were measured as a function of temperature and applied magnetic field to study the ordinary and spontaneous Hall coefficients. In the ferromagnetic regime, 100 K< T< 200 K,(− R s/R o)× T was found to be proportional to exp (− E c/k B T), where R s is the spontaneous Hall coefficient, R o is the ordinary Hall coefficient, and E c is the core energy of the magnetic dipole. In addition, R s was found to be proportional to ρ xx 2 in the low-temperature regime (T< 160 K) where the ordinary Hall coefficient, R o, is independent of temperature. A scaling behavior, R s∝ ρ xx was observed at high temperatures (T> 160 K). Hall effects of [110] and [100] oriented films are compared to each other. The results are discussed in terms of the exiting theories.