Strong magnetoelastic effect in CeCo1xFexSi as Néel order is suppressed

V. F. Correa, A. G. Villagrán Asiares, D. Betancourth, S. Encina, P. Pedrazzini, P. S. Cornaglia, D. J. García, J. G. Sereni, B. Maiorov, N. Caroca Canales, and C. Geibel
Phys. Rev. B 100, 184409 – Published 11 November 2019

Abstract

A very strong magnetoelastic effect in the CeCo1xFexSi alloys is reported. The strength of the magnetostrictive effect can be tuned upon changing x. The moderate low-temperature linear magnetostriction observed at low Fe concentrations becomes very large (ΔLL16T,2K=3×103) around the critical concentration xc0.23 at which the long-range antiferromagnetic order vanishes. Upon increasing doping through the nonmagnetic region (x>xc), the magnetostriction strength gradually weakens again. The interplay between magnetic order and the Kondo screening appears to cause an enhanced valence susceptibility slightly changing the Ce ions valence, ultimately triggering the large magnetostriction observed around the critical concentration. Previous studies of the evolution of the lattice parameters with x as well as magnetization and x-ray absorption spectroscopy measurements support this hypothesis.

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  • Received 15 February 2019
  • Revised 28 October 2019

DOI:https://doi.org/10.1103/PhysRevB.100.184409

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

V. F. Correa, A. G. Villagrán Asiares*, D. Betancourth, S. Encina, P. Pedrazzini, P. S. Cornaglia, D. J. García, and J. G. Sereni

  • Centro Atómico Bariloche (CNEA) and Instituto Balseiro (U. N. Cuyo), 8400 Bariloche, Río Negro, Argentina

B. Maiorov

  • National High Magnetic Field Laboratory, MS E536 Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

N. Caroca Canales and C. Geibel

  • Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresde, Germany

  • *Present address: Nuklearmedizinische Klinik und Poliklinik Klinikum rechts der Isar der Technischen Universität, München, Germany.

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Issue

Vol. 100, Iss. 18 — 1 November 2019

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