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Electron Magnetic Resonance of Eu²⁺ in SrCl₂:Eu Single Crystal

Journal of Magnetics, Volume 17, Number 4, 31 Dec 2012, Pages 251-254

Soo Hyung Lee (Department of Laser and Optical Information Engineering, Cheongju University), Tae Ho Yeom *

(Department of Laser and Optical Information Engineering, Cheongju University), Sung-Hwan Kim (Department of Radiological Science, Cheongju University)

Abstract

The electron paramagnetic resonance (EPR) of the Eu²⁺ ion in SrCl₂:Eu single crystal has been investigated using an X-band spectrometer. The angular dependence of magnetic resonance positions for the Eu²⁺ impurity ion in the crystallographic aa-plane is analyzed with effective spin-Hamiltonian. The EPR spectra of the isolated Eu²⁺ center merged to each other. The hyperfine splitting of the isolated Eu²⁺ center due to the 151Eu nucleus is approximately 35 G. Three kinds of Eu²⁺ centers except the isolated Eu²⁺ center, Eu²⁺ pairs, Eu²⁺ triples, and other Eu²⁺ clusters, are split from the fitting of the integrated experimental spectrum with the Gaussian curve. The calculated spectroscopic splitting parameters of the Eu²⁺ pairs, Eu²⁺ triples, and other Eu²⁺ clusters in SrCl₂:Eu crystal are g₁ = 2.06, g₂ = 1.94, and g₃= 1.93, respectively.

Keywords: EPR; SrCl2:Eu crystal; Eu2+ impurity; clustered Eu2+ ions

DOI: http://dx.doi.org/10.4283/JMAG.2012.17.4.251

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