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Abstract:
Results of magnetic, specific heat, electric and thermal transport
studies carried out on the novel hexagonal-type structure Ce6Pd12In5
compound, with a unique site for Ce, two sites for In and four sites for
Pd are reported. The compound exhibits long-range order, probably of
antiferromagnetic type, below T-N = 1.6 K in spite of a moment reducing
Kondo effect acting on the magnetic Ce3+ ions. A strong influence of
magnetic field on the low temperature dependencies of susceptibility,
specific heat and electrical resistivity is observed. The
crystal-electric field effect, CEF, plays an influential role in the
ground state of this compound. The CEF parameters have been estimated.
Based upon the low-temperature specific heat we observe heavy fermion
behavior with the electronic specific heat coefficient that is enhanced
to the value of gamma = 132 mJ/Ce-mol K-2. In the electrical
resistivity, a logarithmic character rho(4f)(T) similar to -InT is
observed that arises from incoherent Kondo scattering. Towards low
temperature this behavior evolves into Kondo lattice formation with a
coherence temperature T-coh similar or equal to 5.3 K, before long-range
order takes place. We propose that Ce6Pd12In5 presents a new case study
for competing Kondo and magnetic ordering in a high-symmetry lattice,
with CEF and magnetocrystalline anisotropy further impacting upon the
cooperative magnetic behavior. (C) 2014 Elsevier B.V. All rights
reserved.
