Low-temperature dynamic magnetic properties of PdxCo50Al50-x alloys

This paper reports low-temperature ac magnetic susceptibility measurements on the Pd(x)Co(50)Al(50-x)alloy system with 5 less than or equal to x less than or equal to 10. The temperature dependence of the in-phase susceptibility component phi'(omega,T) of specimens with x less than or equal to 8 cooled in a zero magnetic field shows a cusp which is rounded in a magnetic field, indicating rather pure spin-glass behaviour. The positions of the cusps (freezing temperatures, T-f) and the frequencies of the ac field are scaled according to a conventional critical slowing down law. The alloy with x=10 indicates re-entrant behaviour in the range 18-139 K. The thermoremanent magnetization obeys a logarithmic time dependence.