Tricritical point and suppression of the Shastry-Sutherland phase in Ce2(Pd1xNix)2Sn

J. G. Sereni, G. Schmerber, M. Gómez Berisso, B. Chevalier, and J. P. Kappler
Phys. Rev. B 85, 134404 – Published 2 April 2012

Abstract

Structural, magnetization, and heat capacity measurements were performed on Ce2(Pd1xNix)2Sn compounds covering the full range of the Mo2FeB2 structure stability (0x0.25). In this system, the two transitions observed in Ce2Pd2Sn (antiferromagnetic TN=4.8 K and ferromagnetic TC=2.1 K) converge into a tricritical point at Tcr3.4 K for xcr0.3, where the intermediate antiferromagnetic (AF) phase is suppressed. The decrease of the TN(x) phase boundary is due to an incipient Kondo screening of the Ce-4f moments. This effect and the increase of local atomic disorder affect the formation of Ce-magnetic dimers on which the Shastry-Sutherland lattice (SSL) builds up. On the contrary, the TC(x) transition to the ferromagnetic ground state increases as a consequence of the weakening of the intermediate phase. Applied magnetic fields also suppress the AF-SSL phase as it was already observed in the stoichiometric compound.

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  • Received 11 October 2011

DOI:https://doi.org/10.1103/PhysRevB.85.134404

©2012 American Physical Society

Authors & Affiliations

J. G. Sereni1,*, G. Schmerber2, M. Gómez Berisso1, B. Chevalier3, and J. P. Kappler2

  • 1División Bajas Temperaturas, CAB-CNEA and Conicet, 8400 S. C. de Bariloche, Argentina
  • 2Institut de Physique et Chimie de Strasbourg, UMR 7504 CNRS-UDS, 23 rue du Loess, B.P. 43, F-67034 Strasbourg Cedex 2, France
  • 3Centre National de la Recherche Scientifique, Université de Bordeaux, ICMCB, 87 av. Dr. Schweitzer, F-33608 Pessac Cedex, France

  • *jsereni@cab.cnea.gov.ar

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Vol. 85, Iss. 13 — 1 April 2012

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