Heat Capacity of Heavy Fermion Compound CeCu_4Ga in High Magnetic Fields

• Authors: A. Kowalczyk , T. Toliński , M. Reiffers , M. Zapotoková , M. Falkowski , E. Gažo
• Languages of publication: EN

Abstracts

EN

The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline CeCu_{4}Ga are presented. Magnetic ordering was not observed down to 2 K. For temperature T < 200 K a Curie-Weiss behavior is observable giving an effective magnetic moment μ_{eff} =2.53 μ_{B}/f.u. The experimental value of μ_{eff} is close to the calculated one for a free Ce^{3+} ion (μ_{eff} = 2.54 μ_{B}/f.u.), thus indicating the presence of well localized magnetic moments carried by the stable Ce^{3+} ions. At low temperatures the electronic heat capacity coefficient value depends strongly on the temperature range used for the extrapolation and applied magnetic field. We observe a typical heavy fermion behavior with γ value of about 380 mJ mol^{-1} K^{-2} obtained from extrapolation to T = 0 K of the temperature range above 7 K. However, extrapolation of the lowest temperatures range yields the γ value of 3.3 J mol^{-1} K^{-2}.

Keywords

EN

65.40.Ba; 71.20.Eh; 71.27.+a

Discipline

• 71.20.Eh: Rare earth metals and alloys
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 65.40.Ba: Heat capacity(for specific heat of magnetic materials, see 75.40.-s)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 123-125

Dates

published

2009-01

Contributors

author

A. Kowalczyk

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

author

T. Toliński

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

author

M. Reiffers

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53 Košice, Slovakia

author

M. Zapotoková

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53 Košice, Slovakia

author

M. Falkowski

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

author

E. Gažo

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 043 53 Košice, Slovakia

References

• 1. T. Toliński, A. Kowalczyk, G. Chełkowska, M. Pugaczowa-Michalska, B. Andrzejewski, V. Ivanov, A. Szewczyk, M. Gutowska, Phys. Rev. B 70, 064413 (2004)
• 2. A. Kowalczyk, M. Pugaczowa-Michalska, T. Toliński, Phys. Status Solidi B 242, 433 (2005)
• 3. A. Kowalczyk, M. Falkowski, V.H. Tran, M. Pugaczowa-Michalska, J. Alloys Comp. 440, 13 (2007)
• 4. A. Kowalczyk, T. Toliński, M. Reiffers, M. Pugaczowa-Michalska, G. Chełkowska, J. Phys., Condens. Matter 20, 255252 (2008)
• 5. E. Bauer, N. Pillmayr, E. Gratz, D. Gignoux, D. Schmitt, K. Winzer, J. Kohlmann, J. Magn. Magn. Mater. 71, 311 (1988)
• 6. E. Bauer, E. Gratz, N. Pillmayr, Solid State Commun. 62, 271 (1987)
• 7. U. Zülicke, A.J. Millis, Phys. Rev. B 51, 8996 (1995)
• 8. T. Rus, H. Wilhelm, O. Stockert, T. Lühmann, N. Caroca-Canales, J.G. Sereni, C. Geibel, F. Steglich, Physica B 359-361, 62 (2005)
• 9. J.W. Kim, J. Callaway, D.P. Chen, Phys. Rev. B 47, 2890 (1993)
• 10. S. Lipiński, Czech. J. Phys. 52, 287 (2002)

Identifiers

DOI

10.12693/APhysPolA.115.123