Fast broadband cluster spin-glass dynamics in PbFe${}_{1/2}$Nb${}_{1/2}$O${}_3$

C. Stock, B. Roessli, P. M. Gehring +11

PbFe${}_{1/2}$Nb${}_{1/2}$O${}_3$ (PFN) is a relaxor ferroelectric (T${}_c$ $\sim$ 400 K) consisting of disordered magnetic Fe${}^{3+}$ (S=$\frac{5}{2}$, L$\approx$0) ions resulting in a l…