Comparison of a Shastry-Sutherland lattice stability in Ce2Pd2Sn as a function of field and doping

Abstract

A comparative study of the stability of a Shastry-Sutherland lattice (SSL) in Ce2Pd2Sn under different physical conditions is presented. Applied magnetic field suppresses the SSL of stoichiometric Ce2Pd2Sn in a magnetic critical point at Tcr (B) = 4.2 K and Bcr = 0.13 T, whereas 25% of Ni does it at Tcr (N i) = 3.4 K. Electronic concentration variation, driven by the increase of Pd (holes) concentration in Ce2Pd2+y In1−y , decreases the magnetic transition down to TM = 2.8 K in the limit of the alloy solubility, i.e. y = 0.4. The existence of a M (B) plateau in SSL predicted by theory and the crossing of those isotherms, previously observed in the model compound SrCu2(BO3)2 are analyzed.