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The pyrochlore oxides Dy$_{2}$Ti$_{2}$O$_{7}$ and Ho$_{2}$Ti$_{2}$O$_{7}$ arewell studied spin ice systems and have shown the evidences of magnetic monopoleexcitations. Unlike these, Dy$_{2}$Zr$_{2}$O$_{7}$ is reported to crystallizein a distorted fluorite structure. We present here the magnetic and heatcapacity studies of La substituted Dy$_{2}$Zr$_{2}$O$_{7}$. Our findingssuggest the absence of spin ice state in Dy$_{2}$Zr$_{2}$O$_{7}$ but theemergence of the magnetic field induced spin freezing near T $\approx$ 10 K inac susceptibility measurements which is similar to Dy$_{2}$Ti$_{2}$O$_{7}$. Themagnetic heat capacity of Dy$_{2}$Zr$_{2}$O$_{7}$ shows a shift in the peakposition from 1.2 K in zero field to higher temperatures in the magnetic field,with the corresponding decrease in the magnetic entropy. The low temperaturemagnetic entropy at 5 kOe field is Rln2 - (1/2)Rln(3/2) which is same as forthe spin ice state. Substitution of non-magnetic, isovalent La$^{3+}$ forDy$^{3+}$ gradually induces the structural change from highly disorderedfluorite to weakly ordered pyrochlore phase. The La$^{3+}$ substitutedcompounds with less distorted pyrochlore phase show the spin freezing at lowerfield which strengthens further on the application of magnetic field. Ourresults suggest that the spin ice state can be stabilized inDy$_{2}$Zr$_{2}$O$_{7}$ either by slowing down of the spin dynamics or bystrengthening the pyrochlore phase by suitable substitution in the system.

Emergence of weak pyrochlore phase and signature of field induced spin ice ground state in Dy$_{2-x}$La$_{x}$Zr$_{2}$O$_{7}$; x = 0, 0.15, 0.3