Effect of rare-earth ion local anisotropy on macroscopic magnetic properties of (La0.985Ho0.015)3Ga5SiO14 lagnasite

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Experimental and theoretical studies of the magnetic properties of the unique Ising-like paramagnet (La0.985Ho0.015)3Ga5SiO14 have been carried out. We found magnetic anisotropy in strong magnetic field (up to 5 T) rotated in the ab*, b*c and ac planes at low temperatures (T ≤ 5K). We show that the observed magnetization features are connected with the local orientation and distribution of the Ho3+ Ising axes, which may deviate from the symmetry-allowed directions due to Ga/Si random filling in the local environment of the magnetic ions.

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A. Tikhanovskii

Prokhorov General Physics Institute of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: tikhanovskii@phystech.edu
俄罗斯联邦, Moscow

V. Ivanov

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: tikhanovskii@phystech.edu
俄罗斯联邦, Moscow

A. Kuzmenko

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: tikhanovskii@phystech.edu
俄罗斯联邦, Moscow

A. Mukhin

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: tikhanovskii@phystech.edu
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Angular dependences of magnetization (La0.985Ho0.015)3Ga5SiO14 at a temperature of 5 K and a rotation of a field of 5 T in the planes ab*(a), ac (b) and b*c (c). Points – experiment, solid line – theory.

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3. Fig. 2. Schematic representation of the Isingian axes of Ho3+ ions in (La0.985Ho0.015)3Ga5SiO14: α is the deviation of the Isingian axis from the plane ab (shown in position 2 for convenience), β is the deviation of the projection of the Isingian axis on the plane b*c from the c axis. The set of Isingian axes defined in this way, connected by the symmetry operations C2 and C3, restores the symmetry of P321.

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4. Fig. 3. Field dependences of magnetization (La0.985Ho0.015)3Ga5SiO14 at temperatures of 1.9 K (a), 5 K (b) and magnetic field orientations H|| a, b*, c and c39ob* – corresponding to the minimum on the angular dependence, when the magnetic field rotates in the b*c plane. Open symbols are an experiment, a solid line is a theory.

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