The magnetic susceptibility of Ag-Mn and Cu-Mn solid solutions between 1.2°K and 368°K

Summary

The magnetic susceptibility of Ag-Mn and Cu-Mn solid solutions containing between 0.25 and 5.3 at % Mn has been measured between 1.2 and 368°K. The alloys obey a Curie-Weiss law up to and including liquid nitrogen temperatures andpeff, effective magneton number, values derived for the manganese atom are discussed and compared with other published values. At liquid hydrogen temperatures the alloys no longer obey a Curie-Weiss law. It has been found that some of the alloys show a transition from a paramagnetic into an antiferromagnetic state. This occurs at a certain temperature, known as the Néel temperarureT _N . The field dependence of the susceptibility was also investigated. No field dependence occurs as long as the temperature at which measurements are done, is far above the Néel temperatureT _N . Once in the neighbourhood of this transition temperature T_N field dependence is observed.