The approach to magnetic order in rhodium-cobalt alloys

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Abstract
Magnetic data are presented for rhco alloys with cobalt concentrations in the range 28 to 44 at.% and over temperatures ranging from 1.6 to 300k. At low concentrations the system has been previously described as an enhanced band paramagnet, however it is found that local moments are stabilized in alloys having cobalt concentrations below the critical level for long range ferromagnetism, and it is the local moments which are the dominating influence in the initial stages of magnetic order. Two stages of order are distinguished in those samples which contain local moments. Alloys with concentrations up to 42% have magnetic characteristics commonly associated with spin glasses. There are indications that samples with concentrations in excess of about 36% are ferromagnetic at low temperatures. The magnetic properties are distinctly different at 44% , possibly as a result of a change in crystal structure.