Evolution of spin freezing transition and structural, magnetic phase diagram of Dy[Formula: see text] La[Formula: see text] Zr[Formula: see text] O[Formula: see text] (0 [Formula: see text] [Formula: see text] [Formula: see text] 2.0)

Dy[Formula: see text] Zr[Formula: see text] O[Formula: see text] a disordered pyrochlore system, exhibits the spin freezing behavior under the application of the magnetic field. We have performed detailed magnetic studies of Dy[Formula: see text] La[Formula: see text] Zr[Formula: see text] O[Formula: see text] to understand the evolution of the magnetic spin freezing in the system. Our studies suggest the stabilization of the pyrochlore phase with the substitution of non-magnetic La along with the biphasic mixture of fluorite and pyrochlore phases for the intermediate compositions. We observed that the spin freezing (T[Formula: see text] [Formula: see text] 17 K) at higher La compositions (1.5 [Formula: see text] [Formula: see text] [Formula: see text] 1.99) is similar to the field-induced spin freezing for low La compositions (0 [Formula: see text] [Formula: see text] [Formula: see text] 0.5) and the well-known spin ice systems Dy[Formula: see text] Ti[Formula: see text] O[Formula: see text] and Ho[Formula: see text] Ti[Formula: see text] O[Formula: see text] . The low-temperature magnetic state for higher La compositions (1.5 [Formula: see text] [Formula: see text] [Formula: see text] 1.99) culminates into a spin-glass like state below 6 K. Cole–Cole plot and Casimir-du Pr[Formula: see text] fit shows the narrow distribution of spin relaxation time in these compounds.