Paramagnetic Centers in Two Phases
of Manganese-Doped Lanthanum Gallate

V. A. Vazhenin*, A. P. Potapov, V. B. Guseva, and M. Yu. Artyomov

Institute of Physics and Applied Mathematics, Gorki Ural State University, pr. Lenina 51, Yekaterinburg, 620083 Russia

* e-mail: vladimir.vazhenin@usu.ru

Received September 25, 2008

Abstract—An EPR study of two phases of manganese-doped lanthanum gallate (with a first-order structural
transition occurring at 430 K) has revealed Gd³⁺, Fe³⁺, and Mn⁴⁺ centers at room temperature and 438 K. The
parameters of spin Hamiltonians are determined for the Gd³⁺, Fe³⁺, and Mn⁴⁺ rhombohedral centers in the high-
temperature phase (with no other centers found here) and for the monoclinic center Gd³⁺ in the low-temperature
phase. Both in the orthorhombic and in the rhombohedral phase, crystallographic twins (or ferroelastic
domains) are observed.

PACS numbers: 76.30.-v, 76.30.Kg

DOI: 10.1134/S1063783409050059

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