A study of the temperature-dependent magnetic susceptibility and electrical resistivity ρ(T) (0.5-300 K) on single-phase alloys (CaCu5 type), prepared by argon arc melting, reveals a magnetic phase transition with a nonmonotonous decrease of the ordering temperature from Tc=115 K for x=0 to Tc≈0 for x=0.40. A kink in the susceptibility at about 70 K indicates that ferromagnetism (at x<0.1) transforms to a complex magnetic order for 0.125≤x≤0.35. Above that concentration ρ(T)= ρ0+ATn changes from n≈2 to n≈1.5, a characteristic for non-Fermi-liquid behavior. Under pressure Tc stays almost constant for x=0.125 but dTc/dp grows with increasing Ru content. On the contrary, applied fields up to 12 T do not affect Tc. Low-temperature specific heat and ac susceptibility for x=0.40 confirm the absence of long-range magnetic order down to 0.5 K. For x=0.35 Cp/T= 62 mJ/mol K at 1.5 K, a value which is three times larger than that of CeRh 3B2.
|Number of pages||3|
|Journal||Journal of Applied Physics|
|Publication status||Published - 1998|