ACTA

Magnetic Field Enhancement of the Hall Effect in Dilute Magnetic System La_{1 - x}Ce_xB₆ (x ≤ 0.1)

A.V. Bogach^a, V.V. Glushkov^a, S.V. Demishev^a, N.E. Sluchanko^a, N.Yu. Shitsevalova^b, V.B. Fillipov^b and K. Flachbart^c
^aA.M. Prokhorov General Physics Institute of RAS, 38, Vavilov str., Moscow, 119991, Russia
^bInstitute for Problems of Materials Science of UAS, 3, Krzhyzhanovsky Str., 03680 Kiev, Ukraine
^cCentre of Low Temperature Physics, IEP SAS and IPS FS UPJS, 04001 Košice, Slovakia

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Magnetic field dependences of the Hall coefficient R_H and resistivity have been studied in detail for dilute magnetic compounds La_{1 - x}Ce_xB₆ (x ≤ 0.1) at temperatures 1.8-300 K. It was established that the regime of weak localization of charge carriers, which was observed in these heavy fermion systems below 30 K destroys gradually in magnetic field up to 8 T. Moreover, in addition to the strong negative magnetoresistance (Δ ρ/ρ ≈ 80%) a drastic enhancement of the negative Hall coefficient in magnetic field (Δ R_H/R_H ≈ 50%) has been deduced at liquid helium temperatures. The results of comprehensive analysis contradict the predictions of Kondo-impurity approach for this archetypal strongly correlated electron system in the dilute impurity limit. An alternative interpretation of La_{1 - x}Ce_xB₆ properties is developed on the basis of spin-polaron approach, Pauli paramagnetism and the density of states renormalization effects at low temperatures.

DOI: 10.12693/APhysPolA.118.931
PACS numbers: 72.15.Gd