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arXiv · 1801.02836

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

O. Florea·E. Lhotel·H. Jacobsen·C. S. Knee·P. P. Deen
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Abstract

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

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O. Florea, E. Lhotel, H. Jacobsen, C. S. Knee, P. P. Deen. 2018-01-09. Absence of magnetic ordering and field induced phase diagram in the Gadolinium Aluminium garnet. https://doi.org/10.1103/physrevb.96.220413

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