The magnetic structures of the new R3Pd5 compounds (R = Tb, Ho)
In our recent work we have investigated the “R2Pd3” phase (R = rare earth) and found that it actually corresponds to the stoichiometry R3Pd5. This compound is formed by R = Sc, Y, Gd-Lu, including Yb; all of them crystallizing in the Pu3Pd5 prototype [oS32, Cmcm]. Two Wyckoff sites are available in the unit cell for the R atoms, while three crystallographic positions are occupied by Pd atoms. Antiferromagnetic behavior has been observed for Tb and Ho compounds with two subsequent transitions (TN1 = 13.5 K and TN2 = 6.5 K for Tb3Pd5, TN1 = 7.2 K and TN2 = 4.2 K for Ho3Pd5). Effective paramagnetic moments of 9.64 and 10.60 μB for Tb3Pd5 and Ho3Pd5, respectively, are obtained from the Curie-Weiss law, with negative values of paramagnetic Curie temperature (-11 K for Tb3Pd5 and -4 K Ho3Pd5) indicating antiferromagnetic interaction. The isothermal magnetization measurements confirm the antiferromagnetic ordering of the two compounds. From our data we cannot distinguish whether the two R sublattices distinctly order at the two different TN, or if both are simultaneously involved at the two transitions. By neutron diffraction we plan to study the magnetic structures.
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PROVINO Alessia; GSCHNEIDNER JR. Karl A.; MANFRINETTI Pietro and RITTER Clemens. (2016). The magnetic structures of the new R3Pd5 compounds (R = Tb, Ho). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2459
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