Quasi-two-dimensional ferromagnetism in the triangular magnet EuAl$_{12}$O$_{19}$

A. Eli\'a\v{s}; G. Bastien; J. Priessnitz; M. Du\v{s}ek; P. Bal\'a\v{z}; P. Proschek; Q. Courtade; R. H. Colman; T. Haidamak

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Quasi-two-dimensional ferromagnetism in the triangular magnet EuAl$_{12}$O$_{19}$

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arxiv 2405.15479 v2 pith:UBL4OOUH submitted 2024-05-24 cond-mat.str-el

G. Bastien , Q. Courtade , A. Eliáš , T. Haidamak , P. Proschek , M. Dušek , J. Priessnitz , P. Baláž

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R. H. Colman

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abstract

We report ferromagnetic ordering at $T_\mathrm {C}=1.3\,$K in the quasi-two dimensional magnet EuAl$_{12}$O$_{19}$ with large spins $S=7/2$. This ferromagnetic state was characterized by magnetization and specific heat measurements and the experimental results were compared with classical Monte Carlo simulations. They reveal a strong single ion anisotropy leading to an uniaxial spontaneous magnetization along the $c$ axis. Furthermore the application of a magnetic field in the hard magnetization plane $ab$ reduces the Curie temperature and it reaches zero temperature at a magnetic field of $\mu_\mathrm{0} H_c \approx 0.5\,$T.

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