Tri-critical point and suppression of the Shastry-Sutherland phase in Ce$_{2}$Pd$_{2}$Sn by Ni doping

J. G. Sereni; G. Schmerber; M. Gómez Berisso; B. Chevalier; J. P. Kappler

doi:10.1103/PhysRevB.85.134404

paper

Tri-critical point and suppression of the Shastry-Sutherland phase in Ce $_{2}$ Pd $_{2}$ Sn by Ni doping

arXiv:1110.0426 · doi:10.1103/PhysRevB.85.134404

Abstract

Structural, magnetization and heat capacity measurements were performed on Ce $_{2}$ (Pd $_{1 - x}$ Ni $_{x}$ ) $_{2}$ Sn ( $0 \leq x \leq 0.25$ ) alloys, covering the full range of the Mo $_{2}$ FeB $_{2}$ structure stability. In this system, the two transitions observed in Ce $_{2}$ Pd $_{2}$ Sn (at $T_{N} = 4.8$ \,K and $T_{C} = 2.1$ \,K respectively) converge into a tri-critical point at $T_{cr} \approx 3.4$ \,K for $x \approx 0.3$ , where the intermediate antiferromagnetic AF phase is suppressed. The $T_{N} (x)$ phase boundary decrease is due to an incipient Kondo screening of the Ce-4f moments and local atomic disorder in the alloy. Both mechanisms affect the formation of Ce-magnetic dimers on which the Shastry-Sutherland lattice (SSL) builds up. On the contrary, the $T_{C} (x)$ transition to the ferromagnetic ground state increases as a consequence of the weakening of the AF-SSL phase. Applied magnetic field also suppresses the AF phase like in the stoichiometric compound.

6 pages, 8 figures

Tri-critical point and suppression of the Shastry-Sutherland phase in Ce2​Pd2​Sn by Ni doping

Abstract

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Tri-critical point and suppression of the Shastry-Sutherland phase in Ce $_{2}$ Pd $_{2}$ Sn by Ni doping