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HL: Fachverband Halbleiterphysik

HL 101: Transport: Nanoelectronics II - Spintronics and Magnetotransport (jointly with TT, MA)

HL 101.6: Talk

Friday, March 30, 2012, 11:00–11:15, BH 243

Anomalous Hall conductivity in Ni and its alloys — •D. Ködderitzsch, K. Chadova, J. Minar, and H. Ebert — Universität München, Department Chemie, Butenandtstraße 5-13, D-81377 München, Germany

The anomalous Hall conductivity (AHC) in Ni as discussed on the basis of the intrinsic contribution shows a strong overestimation of the AHC [1]. Recent studies using the LSDA+U approximation seem to remedy this problem [2]. However, still missing is taking into account the temperature dependence of the AHC which has recently been re-investigated [3] and changes the picture.

Using our recently implemented [4] first-principles approach to describe transverse transport based on the Kubo-formalism in the Kubo-Středa formulation we study the anomalous Hall conductivity (AHC) in Ni. To take into account the effect of correlations we extended our method to employ the LSDA+U, as well as the LSDA+DMFT to go beyond the LSDA approximation to DFT. Furthermore, we study the influence of finite temperatures on the AHC by using an alloy-analogy for a quasistatic representation of the thermal displacements of the atoms. In addition, we performed calculations for dilute impurities in the Ni host.
Nagaosa et al. Rev. Mod. Phys. 82, 1539 (2010) and references therein
Weischenberg et al. PRL 107, 106601 (2011); Fuh and Guo PRB 84, 144427 (2011)
Xiao, Jin
Lowitzer, Gradhand, Fedorov, Mertig, Ködderitzsch, Ebert, PRL 105, 266604 (2010) and PRL 106, 056601 (2011)