  The anomalous Hall effect (AHE) in perpendicularly magnetized L10-Mn1.5Ga
single-crystalline films is investigated as a function of degree of long-range
chemical ordering and temperature. Our results provide firm evidence that
phonons has negligibly smaller effect on skew scattering contributions to AHE
resistivity than defects, the overlook of which in conventional scaling laws
results in significant discrepancies and exponent n beyond 2 when fitting the
data. We find that the broken of long-range chemical ordering strongly affects
both intrinsic and extrinsic contributions of AHE conductivity, e.g., it
greatly suppresses intrinsic contributions by influencing the topology of the
band structures. Our results are of great importance for both physical
understanding and technological engineering of the AHE.
