Charge Transport and Magnetism in Tm_{0.03}Yb_{0.97}B₁₂

• Authors: V. Glushkov , A. Azarevich , M. Anisimov , A. Bogach , S. Demishev , A. Dukhnenko , V. Filipov , K. Flachbart , S. Gabáni , S. Gavrilkin , M. Kondrin , N. Shitsevalova , N. Sluchanko
• Languages of publication: EN

Abstracts

EN

Transport and magnetic properties of polycrystalline Tm_{0.03}Yb_{0.97}B₁₂ samples were investigated at temperatures 1.8-300 K in magnetic fields up to 9 T. The activated behavior of resistivity, the Hall coefficient and thermopower is described in terms of a narrow gap ε_g ≈ 16.6 meV, which controls the charge transport in Tm_{0.03}Yb_{0.97}B₁₂ at T>40 K. The maximum of magnetic susceptibility found at 50 K is shown to be induced by a spin gap Δ ≈ 4.7 meV being close to the half of the spin fluctuation energy in YbB₁₂. Large diffusive thermopower S=AT, A=-29.1 μV/K² and the Pauli susceptibility χ₀ ≈ 7.2×10¯³ emu/mol found below 20 K seem to be associated with the many-body resonance, which corresponds to states with an enhanced effective mass m* ≈ 250m₀ (m₀ - free electron mass). The effective parameters of magnetic centers and the analysis of anomalies favor the nonequivalent states of substitute Tm ions.

Keywords

EN

72.15.Gd; 72.15.Jf; 71.27.+a

Discipline

• 72.15.Jf: Thermoelectric and thermomagnetic effects
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 72.15.Gd: Galvanomagnetic and other magnetotransport effects(see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 985-987

Dates

published

2017-04

Contributors

author

V. Glushkov

• Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia

author

A. Azarevich

• Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia

author

M. Anisimov

• Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia

author

A. Bogach

• Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia

author

S. Demishev

• Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia

author

A. Dukhnenko

• Frantsevich Institute for Problems of Materials Science, NAS, Krzhyzhanovsky Str. 3, 03680 Kiev, Ukraine

author

V. Filipov

• Frantsevich Institute for Problems of Materials Science, NAS, Krzhyzhanovsky Str. 3, 03680 Kiev, Ukraine

author

K. Flachbart

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

S. Gabáni

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

S. Gavrilkin

• Lebedev Physical Institute of RAS, Leninskii pr. 53, 119991 Moscow, Russia

author

M. Kondrin

• Vereshchagin Institute of High Pressure Physics of RAS, Troitsk, 142190 Moscow, Russia

author

N. Shitsevalova

• Frantsevich Institute for Problems of Materials Science, NAS, Krzhyzhanovsky Str. 3, 03680 Kiev, Ukraine

author

N. Sluchanko

• Prokhorov General Physics Institute of RAS, Vavilov Str. 38, 119991 Moscow, Russia

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Identifiers

DOI

10.12693/APhysPolA.131.985