The Effect of Ce Dilution on the Ferromagnetic Ordering in CeAuGe

• Authors: B. Sondezi , A. Strydom
• Languages of publication: EN

Abstracts

EN

Transport and thermodynamic properties of the well-ordered hexagonal CeAuGe compound have been studied. This compound is known to order ferromagnetically at T_{C} = 10 K with well-defined anomalies in magnetic susceptibility χ(T), electrical resistivity ρ(T) and specific heat C_p(T) characterising the phase transition. The location of T_{C} has been observed to be unstable and enhanced even in moderate applied magnetic fields. However, the dilution of magnetic species, Ce, with the non-f electron element, La, is shown in this work to achieve a continuous suppression of T_{C} to 0 K. The integrity of the space group and the details of the unit cell occupation are retained throughout the substitution series, as is the high-temperature localized Ce-effective magnetic moment μ_{eff} = 2.54 μ_{B}/(mol Ce). Our studies of physical properties down to 0.05 K show a quantum critical form of non-Fermi liquid behaviour, characterised by a logarithmic divergence in C_p(T)/T data in the very dilute Ce content.

Keywords

EN

75.30.Cr; 75.30.Kz; 75.30.Mb

Discipline

• 75.30.Cr: Saturation moments and magnetic susceptibilities
• 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)
• 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)

• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 228-230

Dates

published

2015-02

Contributors

author

B. Sondezi

• Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, South Africa

author

A. Strydom

• Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, South Africa

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Identifiers

DOI

10.12693/APhysPolA.127.228