Thermoelectric Power and Thermal Conductivity of Heavy Fermion CeCu_4Al

• Authors: M. Falkowski , A. Kowalczyk
• Languages of publication: EN

Abstracts

EN

The thermal conductivity and thermopower are discussed for the heavy fermion CeCu_4Al compound. CeCu_4Al is paramagnetic and follows the modified Curie-Weiss law with μ_{eff} = 2.53 μ_{B}/f.u. and θ_{P} = - 10 K indicating on the presence of well localized magnetic moments of Ce^{3+} ions. The determined electronic specific heat coefficient γ = 2.2 J mol^{-1}K^{-2} confirms the heavy fermion character of this compound. Thermopower is positive over the whole temperature range and below T_{max} = 25 K falls rapidly. Based on a simple band model the position and width of the 4f peak nearest to the Fermi level have been estimated. The measured total thermal conductivity of the CeCu_4Al compound increases almost linearly with increasing temperature.

Keywords

EN

72.10.Fk; 72.15.Eb; 72.15.Jf; 72.15.Qm

Discipline

• 72.15.Qm: Scattering mechanisms and Kondo effect(see also 75.20.Hr Local moments in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions in magnetic properties and materials)
• 72.15.Jf: Thermoelectric and thermomagnetic effects
• 72.10.Fk: Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect)
• 72.15.Eb: Electrical and thermal conduction in crystalline metals and alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1056-1058

Dates

published

2012-05

Contributors

author

M. Falkowski

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

author

A. Kowalczyk

• Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland

References

• 1. A. Kowalczyk, T. Toliński, M. Reiffers, M. Pugaczowa-Michalska, G. Chełkowska, J. Phys., Condens. Matter 20, 255252 (2008)
• 2. M. Falkowski, A. Kowalczyk, T. Toliński, Solid State Commun. 150, 1548 (2010)
• 3. E. Bauer, E. Gratz, N. Pillmayr, Solid State Commun. 62, 271 (1987)
• 4. N.E. Bickers, D.I. Cox, J.W. Wilkins, Phys. Rev. B 36, 2036 (1987)
• 5. A.K. Bhattacharjee, B. Coqblin, Phys. Rev. B 13, 3441 (1976)
• 6. M. Falkowski, A. Kowalczyk, T. Toliński, J. Alloys Comp. 509, 6135 (2011)
• 7. U. Gottwick, K. Gloos, S. Horn, F. Steglich, N. Grewe, J. Magn. Magn. Mater. 47-48, 536 (1985)
• 8. E. Bauer, E. Gratz, G. Hutflesz, H. Muller, J. Phys., Condens. Matter 3, 764 (1991)

Identifiers

DOI

10.12693/APhysPolA.121.1056