Moessbauer study of reentrant spin-glass Pdsub(1-x-y)Fesub(x)Mnsub(y): evidence for coexistence of spin-glass and ferromagnetic orderings

The Moessbauer study has been made on the reentrant spin-glass state of Pdsub(0.881)Fesub(0.027)Mnsub(0.092) and Pdsub(0.930)Fesub(0.015)Mnsub(0.055). The anomalous increase of the average hyperfine field anti Hsub(hf), found in some alloys with the reentrant spin-glass transition, was clearly observed below the spin-glass transition temperature Tsub(g). This can be explained as freezing of the transverse spin component at Tsub(g). From the variation of the Moessbauer absorption intensity ratios with applied field, it has been shown that Fe spins behave partly ferromagnetic and partly like a spin-glass. We consider that this fact is an evidence for the coexistence of the spin-glass and ferromagnetic orderings. A model to explain our results has been proposed. It has been also shown that the spin-glass state is microscopically not much affected by magnetic fields up to 5 kOe, the maximum value examined. (author)