Anomalous Magnetic Contributions to Hall Effect in Ho0.5Lu0.5B12

V. Krasnorusskya, A. Bogacha, b, N. Sluchankoa, c, S. Demisheva, c, N. Shitsevalovad, V. Filipovd, G. Pristase, S. Gabanie, K. Flachbartd, V. V. Glushkova, c aA.M. Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilov str., Moscow, 119991 Russia bNational University of Science and Technology MISIS, Moscow, 119049 Russia cMoscow Institute of Physics and Technology, 9 Institutsky per., Dolgoprudny, Moscow Region, 141700 Russia dFrantsevich Institute for Problems of Materials Science, NASU, 3 Krzhizhanovsky str., Kyiv, 03142 Ukraine eInstitute of Experimental Physics, SAS, 47 Watsonova str., Košice, 04001 Slovakia

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Strongly correlated electron system Ho0.5Lu0.5B12 possesses a cooperative dynamic Jahn-Teller instability of the boron cage that affects the rattling modes of loosely bound rare-earth ions, a frustrated antiferromagnetic (AF) ground state and dynamic charge stripes. The Hall effect, resistivity, and magnetization were studied on the single crystals of this AF metal (TN~3.4 K) at temperatures 1.9-4.2 K in magnetic field B≤7 T applied along the principal axis of the fcc lattice. Two components of anomalous Hall effect (AHE) were identified on Hall resistivity ρH(B) curves. The first AHE component to be proportional to magnetization is detected both in the AF and in the paramagnetic state of Ho0.5Lu0.5B12. The second one that contributes to AHE only in the AF phase has the amplitude increasing with lowering of temperature. Both AHE components are strongly anisotropic having maximal amplitudes for B∥(100). The observed AHE features are discussed in terms of spin chirality and Berry phase effects, which could develop in the exotic spin texture of Ho0.5Lu0.5B12 under strong charge carrier scattering on dynamic charge stripes.

DOI:10.12693/APhysPolA.137.767 topics: anomalous Hall effect, antiferromagnetism, spin chirality