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  Interplay of antiferromagnetism and Kondo effect in (Ce1-xLax)8Pd24Al

Bashir, A. K., Tchokonte, M. B. T., Britz, D., Strydom, A. M., & Kaczorowski, D. (2017). Interplay of antiferromagnetism and Kondo effect in (Ce1-xLax)8Pd24Al. Journal of Physics and Chemistry of Solids, 106, 44-51. doi:10.1016/j.jpcs.2017.03.004.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-5021-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-C6DB-6
Genre: Journal Article

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 Creators:
Bashir, A. K.1, Author
Tchokonte, M. B. Tchoula1, Author
Britz, D.1, Author
Strydom, A. M.2, Author              
Kaczorowski, D.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: The interplay of antiferromagnetic (AFM) and Kondo effect in Ce8Pd24Al with the dilution of Ce with La is investigated by means of electrical and thermal transport and magnetic properties measurements. X - ray diffraction studies confirm a cubic AuCu3 - type crystal structure with space group Pm (3) over barm for all compositions in the alloy series (Ce1-xLax)(8)Pd24Al (0 <= x <= 1). Electrical resistivity, rho(T) results show evolution from coherent Kondo lattice scattering with a well defined Kondo peak at T-max to incoherent single-ion Kondo scattering with increasing La content x. Magnetoresistivity MR measurements on Ce dilute alloys are negative and analyzed based on the calculations by Schlottmann for the Bethe - ansatz in the framework of the Coqblin - Schrieffer model and yield values of the Kondo temperature T-K and the effective moment of the Kondo ion mu(K). The decrease of T-max and T-K is described by the compressible Kondo lattice model. The thermoelectric power, S(T) measurements are interpreted within the phenomenological resonance model. The Lorentz number, L/L-0 increases rapidly on cooling the samples and reaches a maximum value around 6 K. The magnetic susceptibility, chi(T) data at high temperature follow the Curie - Weiss behaviour and yield effective magnetic moments, mu(eff) values across the series close to the value of 2.54 mu(B) expected for the free Ce3+ - ion. The low temperature chi(T) shows an AFM anomaly associated with a Neel temperature T-N for alloys in the range 0 <= x <= 0.2. No metamagnetic transition was observed from the magnetization results, M(mu H-0).

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Language(s): eng - English
 Dates: 2017-03-082017-03-08
 Publication Status: Published in print
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Title: Journal of Physics and Chemistry of Solids
Source Genre: Journal
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Publ. Info: Oxford : Pergamon
Pages: - Volume / Issue: 106 Sequence Number: - Start / End Page: 44 - 51 Identifier: ISSN: 0022-3697
CoNE: /journals/resource/110992357322388