Scaling of the anomalous Hall effect in Sr$_{1-x}$Ca$_x$RuO$_3$

Details Scaling of the anomalous Hall effect in Sr$_{1-x}$Ca$_x$RuO$_3$ Scaling of the anomalous Hall effect in Sr$_{1-x}$Ca$_x$RuO$_3$

2003-12-03

arxiv.org/abs/cond-mat/0312092v2

Phys. Rev. Lett. 93, 016602 (2004)

Physics

Condensed Matter

Materials Science

REVTeX 4 style; 5 pages, 3 figures; revised 23/2 and accepted for publication

Scientific paper

10.1103/PhysRevLett.93.016602

The anomalous Hall effect (AHE) of ferromagnetic thin films of Sr$_{1-x}$Ca$_{x}$RuO$_3$ (0 $\leq x \leq$ 0.4) is studied as a function of $x$ and temperature $T$. As $x$ increases, both the transition temperature $T_c$ and the magnetization $M$ are reduced and vanish near $x \sim$ 0.7. For all compositions, the transverse resistivity $\rho_{H}$ varies non-monotonously with $T$, and even changes sign, thus violating the conventional expression $\rho_{H}=R_o B + 4\pi R_s M(T)$ ($B$ is the magnetic induction, while $R_o$ and $R_s$ are the ordinary and anomalous Hall coefficients). From the rather complicated data of $\rho_H$, we find a scaling behavior of the transverse conductivity $\sigma_{xy}$ with $M(T)$, which is well reproduced by the first-principles band calculation assuming the intrinsic origin of the AHE.

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