This article is cited in 4 papers

Impurity centers

Structural transition in lanthanum gallate and transformation of the fine structure of the EPR spectrum of a Gd$^{3+}$ impurity center

V. A. Vazhenin, V. B. Guseva, A. V. Fokin, A. P. Potapov, M. Yu. Artemov

Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg

Abstract: Abrupt changes in resonance positions, hysteretic temperature behavior, and coexistence of phases, which indicate a first-order phase transition, have been revealed from measurements of temperature dependences of the EPR spectra of Gd$^{3+}$ and Mn$^{4+}$ centers in the vicinity of the structural transition of lanthanum gallate. The transformation of monoclinic Gd$^{3+}$ centers into trigonal Gd$^{3+}$ centers upon the phase transition has been used to estimate the adequacy of two approximations of the superposition model for parameters of the zero-field splitting of the ground state.

Received: 08.07.2010

 English version: Physics of the Solid State, 2011, 53:4, 773–778

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