Exploiting the possibility to switch from antiferromagnetic (AFM) and ferromagnetic (FM) ground states (GSs) in out-stoichiometric branches of ${\mathrm{Ce}}_2{\mathrm{Pd}}_2\mathrm{In}$ alloys, the stability of Shastry-Sutherland (ShSu) phase of ${\mathrm{Ce}}_2{\mathrm{Pd}}_2\mathrm{Sn}$ as a function of Sn/In electron doping was studied. Magnetic and specific-heat measurements show that the Ce-rich compositions stabilize the FM-GS throughout the Sn/In-FM substitution, allowing to extend the formation of the ShSu phase up to its collapse in a tricritical point around $y_{cr}=0.5$. On the other hand, this behavior is quite different from that reported in a recent investigation on the AFM branch where atomic disorder at intermediate Sn/In-AFM concentrations inhibits the formation of the ShSu phase.

• Received 17 February 2019
• Revised 15 June 2019

DOI:https://doi.org/10.1103/PhysRevB.100.054421