Magnetic transitions on the pseudo-ternary compounds Ho1-xYxRh2Si2

Magnetic measurements on the pseudo-ternary compounds Ho1-xYxRh2Si2, which substitute nonmagnetic Y for Ho, were performed. The lattice parameters a and c are almost constant by the change of Y composition x. The transition temperatures T-N1, T-t, and T-N2 decrease with increasing x. The critical compositions for T-N1 and T-N2 are determined to be x(N1)=0.98 and x(N2)=0.75, respectively. "The successive component-separated magnetic transitions" appear for the wide x region from x=0 to x=0.75. The partial ordered state, or frustration appears on these compound. The magnetic ordered state persists up to x=0.98 in spite of very dilute Ho-compounds: very weak magnetic interactions. The effective magnetic moments are almost constant from x=0 to 1; mu(eff)=10.6 +/- 0.15 mu(B)/Ho, and magnetic moment mu=10 mu(B)/Ho as well. The Ho0.95Y0.05Rh2Si2 single crystal shows the quite similar magnetic behaviour to that of HoRh2Si2. The constant magnetic moment and constant effective magnetic moment irrespective of x are confirmed from the magnetic behaviours of single crystals Ho1-xYxRh2Si2 (x=0.05, 0.6 and 0.8).