Genesis of the Anomalous Hall Effect in CeAl₂

N. E. Sluchanko^a,b,*, A. V. Bogach^a,b, V. V. Glushkov^a,b, S. V. Demishev^a,b,
M. I. Ignatov^a,b, N. A. Samarin^a, G. S. Burkhanov^c, and O. D. Chistyakov^c

^aInstitute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991 Russia

^bMoscow Physicotechnical Institute,
Institutski proezd 9, Dolgoprudny, Moscow oblast, 141700 Russia

^cBakov Institute of Metallurgy and Materials Science, Russian Academy of Sciences,
Leninski pr. 49, Moscow, 119991 Russia

*e-mail: nes@lt.gpi.ru

Received October 6, 2003

Abstract—The Hall coefficient R_H , resistivity , and Seebeck coefficient S of the CeAl₂ compound with fast
electron density fluctuations were studied in a wide temperature range (from 1.8 to 300 K). Detailed measure-
ments of the angular dependences R_H(, T, H 70 kOe) were performed to determine contributions to the anom-
alous Hall effect and study the behavior of the anomalous magnetic and main components of the Hall
signal of this compound with strong electron correlation. The special features of the behavior of the anomalous
magnetic component were used to analyze the complex magnetic phase diagram HT determined by mag-
netic ordering in the presence of strong spin fluctuations. An analysis of changes in the main contribution
(H, T) to the Hall effect made it possible to determine the complex activation behavior of this anomalous
component in the CeAl₂ intermetallic compound. The results led us to conclude that taking into account spin–
polaron effects was necessary and that the Kondo lattice and skew-scattering models were of very limited appli-
cability as methods for describing the low-temperature transport of charge carriers in cerium-based intermetal-
lic compounds. The effective masses and localization radii of manybody states in the CeAl₂ matrix were esti-
mated to be (55–90)m₀ and 6–10 Å, respectively. The behaviors of the parameters R_H , S, and were jointly
analyzed. The results allowed us to consistently describe the transport coefficients of CeAl₂ . © 2004 MAIK
“Nauka/Interperiodica”.

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