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

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Аннотация

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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Авторлар туралы

A. Tikhanovskii

Prokhorov General Physics Institute of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: tikhanovskii@phystech.edu
Ресей, Moscow

V. Ivanov

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: tikhanovskii@phystech.edu
Ресей, Moscow

A. Kuzmenko

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: tikhanovskii@phystech.edu
Ресей, Moscow

A. Mukhin

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: tikhanovskii@phystech.edu
Ресей, Moscow

Әдебиет тізімі

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Жүктеу
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.

Жүктеу (143KB)
Метадеректер
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.

Жүктеу (60KB)
Метадеректер
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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