Enhancement of band magnetism and features of the magnetically ordered state in the CeB{sub 6} compound with strong electron correlations

Journal Article · Thu Feb 15 04:00:00 EST 2007 · Journal of Experimental and Theoretical Physics

DOI:https://doi.org/10.1134/S106377610701013X· OSTI ID:21072546

Bogach, A V; Glushkov, V V; Demishev, S V; Ivanov, V Yu; Ignatov, M I; Kuznetsov, A V; Samarin, N A; Semeno, A V ^[1]; Shitsevalova, N Yu ^[2]

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1. Russian Academy of Sciences, Prokhorov General Physics Institute (Russian Federation)
2. National Academy of Sciences of Ukraine, Institute of Problems of Material Science (Ukraine)

Precision measurements of transport and magnetic parameters of high-quality CeB{sub 6} single crystals are performed in the temperature range 1.8-300 K. It is shown that their resistivity in the temperature interval 5 K < T < T* {approx} 80 K obeys not a logarithmic law, which is typical of the Kondo mechanism of charge carrier scattering, but the law {rho} {proportional_to} T{sup -1/{eta}} corresponding to the weak localization regime with a critical index 1/{eta} = 0.39 {+-} 0.02. Instead of the Curie-Weiss dependences, the asymptotic form {chi}(T) {proportional_to} T{sup -0.8} is obtained for magnetic susceptibility of CeB{sub 6} in a temperature range of 15-300 K. Analysis of the field dependences of magnetization, magnetoresistance, and the Hall coefficient in the paramagnetic and magnetically ordered phases of CeB{sub 6} and comparison with the results of measurements of Seebeck coefficient, the inelastic neutron scattering coefficient, and EPR spectroscopy lead to the conclusion that the Kondo lattice model and skew scattering model cannot be used for describing the transport and thermodynamic parameters of this compound with strong electron correlations. On the basis of detailed analysis of experimental data, an alternative approach to interpreting the properties of CeB{sub 6} is proposed using (1) the assumption concerning itinerant paramagnetism and substantial renormalization of the density of electron states upon cooling in the vicinity of the Fermi energy, which is associated with the formation of heavy fermions (spin-polaron states) in the metallic CeB{sub 6} matrix in the vicinity of Ce sites; (2) the formation of ferromagnetic nanosize regions from spin polarons at 3.3 K < T < 7 K and a transition to a state with a spin density wave (SDW) at T{sub Q} {approx} 3.3 K; and (3) realization of a complex magnetic phase H-T diagram of CeB{sub 6}, which is associated with an increase in the SDW amplitude and competition between the SDW and antiferromagnetism of localized magnetic moments of cerium ions.

• OSTI ID: 21072546
• Journal Information: Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 1 Vol. 104; ISSN JTPHES; ISSN 1063-7761
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETISM
CERIUM BORIDES
CHARGE CARRIERS
ELECTRON CORRELATION
ELECTRON SPIN RESONANCE
INELASTIC SCATTERING
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MAGNETORESISTANCE
MONOCRYSTALS
NANOSTRUCTURES
NEUTRON DIFFRACTION
NEUTRON REACTIONS
PARAMAGNETISM
POLARONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K