MOSSBAUER EVIDENCE FOR A SPIN-COMPENSATED STATE IN DILUTE Fe-Cu ALLOYS

摘要: There has been considerable recent interest in the existence and nature of bound statel 9 which is thought to be formed certain dilute alloys between localized magnetic impurity moments conduction-electron spins below some critical temperature characteristic alloy. In their communication, Day­ bell SteyertlO presented evidence based on low-temperature resistivity suscepti­ bility measurements for formation such a state consistent with quenching moment·associated very Fe Cu. The results Mossbauer ex­ periments Cu high external fields (42-136 kOe) are here as significant destruction by J1H 0 '"'J k TK where T K order energy change associated state. fact that Mossbau­ er hyperfine .spectrum reflects electronic environment within atomic dimensions 57Fe nucleus enables us make conjec­ tures singlet interaction eu al­ loys reported Kitchens, Steyert, Taylor!! using M<1ssbauer technique exter­ nal up 62 kOe at temper­ atures down 0.4°K. They noted deviations from pure paramagnetic behavior interpreted terms mod­ el due Housley Dash,!2 who introduced phenomenological spin spin­ density waves. Measurements higher (Ho=110 were Blum, Free­ man, Grodzins.1s ideal paramagnet­ ic case field Hhf proportion­ al Brillouin function characterized parameters J, g, H sat 14: