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The robustness of spin liquids with respect to small perturbations, and theway magnetic frustration can be lifted by slight changes in the balance betweencompeting magnetic interactions remains a rich and open issue. We address thisquestion through the study of the Gadolinium Aluminium garnetGd$_3$Al$_5$O$_{12}$, a related compound to the extensively studiedGd$_3$Ga$_5$O$_{12}$. We report on its magnetic properties at very lowtemperature. We show that despite a freezing at about 300 mK, no magnetictransition is observed, suggesting the presence of a spin liquid state down tothe lowest temperatures similarly to Gd$_3$Ga$_5$O$_{12}$, in spite of a largerratio between exchange and dipolar interactions. Finally, the phase diagram asa function of field and temperature is strongly reminiscent from the onereported in Gd$_3$Ga$_5$O$_{12}$. This study reveals the robust nature of thespin liquid phase for Gd ions on the garnet lattice in stark contrast to Gdions on the pyrochlore lattice for which a slight perturbation drives thecompound into a range of magnetically ordered states.

Absence of magnetic ordering and field induced phase diagram in the Gadolinium Aluminium garnet