Tricritical point and suppression of the Shastry-Sutherland phase in Ce2(Pd1-xNix)2Sn - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2012

Tricritical point and suppression of the Shastry-Sutherland phase in Ce2(Pd1-xNix)2Sn

Résumé

Structural, magnetization and heat capacity measurements were performed on Ce2(Pd1-xNix)2Sn compounds covering the full range of the Mo2FeB2 structure stability (0 x 0.25). In this system, the two transitions observed in Ce2Pd2Sn (antiferromagnetic TN=4.8 K and ferromagnetic TC=2.1 K) converge into a tri-critical point at Tcr 3.4 K for xcr 0.3, 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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Dates et versions

hal-00688050 , version 1 (30-08-2023)

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Julián Sereni, Guy Schmerber, Mariano Gómez Berisso, Bernard Chevalier, Jean-Paul Kappler. Tricritical point and suppression of the Shastry-Sutherland phase in Ce2(Pd1-xNix)2Sn. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 85 (13), 134404 (6 p.). ⟨10.1103/PhysRevB.85.134404⟩. ⟨hal-00688050⟩
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