Strongly Correlated Electron Behaviour in CeT_2Al_8 (T~=~Fe,~Co)

• Authors: S. Ghosh , A. Strydom
• Languages of publication: EN

Abstracts

EN

We report on studies of physical properties of the two compounds CeFe_2Al_8 and CeCo_2Al_8 in which we have found varying degrees of electronic correlational phenomena. No magnetic ordering was detected down to 0.4 K in either of the two compounds. At elevated temperatures an incoherent Kondo interaction between the Ce 4f-electron and the conduction electrons is prevalent in both compounds. CeCo_2Al_8 exhibits a stable 4f-electron magnetic moment, but in CeFe_2Al_8 an intermediate-valent state prevails near room temperature that eventually transforms into a Fermi-liquid ground state. The low-temperature specific heat of CeCo_2Al_8 shows typical strongly correlated electron behaviour and a - logT upturn in its electronic specific heat below about 10 K.

Keywords

EN

75.40.Cx; 71.27.+a; 75.30.Mb; 75.20.Hr

Discipline

• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 75.30.Mb: Valence fluctuation, Kondo lattice, and heavy-fermion phenomena(see also 71.27.+a Strongly correlated electron systems, heavy fermions; for heavy-fermion superconductors, see 74.70.Tx)
• 75.20.Hr: Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions(for Kondo effect and scattering mechanisms in electronic conduction, see 72.15.Qm and 72.10.Fk)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 5-6
• Pages: 1082-1084

Dates

published

2012-05

Contributors

author

S. Ghosh

• Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa

author

A. Strydom

• Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa

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Identifiers

DOI

10.12693/APhysPolA.121.1082