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Journal Article

Crystalline field effect and magnetic ordering in the heavy fermion Kondo lattice Ce6Pd12In5


Strydom,  A. M.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Falkowski, M., & Strydom, A. M. (2014). Crystalline field effect and magnetic ordering in the heavy fermion Kondo lattice Ce6Pd12In5. Journal of Alloys and Compounds, 613, 204-212. doi:10.1016/j.jallcom.2014.05.077.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0023-CA7F-5
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.