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American Physical Society, Physical Review Letters, 22(102)

DOI: 10.1103/physrevlett.102.227201

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Coexistence of Universal and Topological Anomalous Hall Effects in MetalCrO2Thin Films in the Dirty Limit

Journal article published in 2009 by W. R. Branford, K. A. Yates, E. Barkhoudarov, J. D. Moore, K. Morrison, F. Magnus, Y. Miyoshi, P. M. Sousa, O. Conde ORCID, A. J. Silvestre ORCID, L. F. Cohen
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This paper is available in a repository.

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Abstract

The scaling exponent of 1.6 between anomalous Hall and longitudinal conductivity, characteristic of the universal Hall mechanism in dirty-metal ferromagnets, emerges from a series of CrO2 films as we systematically increase structural disorder. Magnetic disorder in CrO2 increases with temperature and this drives a separate topological Hall mechanism. We find that these terms are controlled discretely by structural and magnetic defect populations, and their coexistence leads to apparent divergence from exponent 1.6, suggesting that the universal term is more prevalent than previously realized.