Evidence for a dimensionality crossover at the disappearance of magnetism in the Kondo lattice alloy CeCo1xFexSi

J. G. Sereni, M. Gomez Berisso, D. Betancourth, V. F. Correa, N. Caroca Canales, and C. Geibel
Phys. Rev. B 89, 035107 – Published 7 January 2014

Abstract

Structural, magnetic, and thermal measurements performed on CeCo1xFexSi alloys are reported. Three regions can be recognized: (i) Co rich (x0.20) with a decreasing long-range antiferromagnetic order which vanishes at finite temperatures, (ii) an intermediate region (0.20<x0.30) showing a broad magnetic anomaly (CA) in specific heat, and (iii) the nonmagnetic region progressively changing from a non-Fermi-liquid-type behavior towards a Fermi-liquid one as Fe concentration increases. The CA anomaly emerges as an incipient contribution above TN already at x=0.10, which indicates that this contribution is related to short-range correlations likely of quasi-two-dimensional type. Both TN transition and CA anomaly are practically unaffected by an applied magnetic field up to B10T.

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  • Received 15 September 2013
  • Revised 18 November 2013

DOI:https://doi.org/10.1103/PhysRevB.89.035107

©2014 American Physical Society

Authors & Affiliations

J. G. Sereni, M. Gomez Berisso, D. Betancourth, and V. F. Correa

  • Low Temperature Division, CAB-CNEA and CONICET, 8400 San Carlos de Bariloche, Argentina

N. Caroca Canales and C. Geibel

  • Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

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Vol. 89, Iss. 3 — 15 January 2014

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