ESR study of Ce3+ ions in a CaGa2S4 single crystal

被引：1

作者：

Kitajima, Ittetsu ^{[1
]}

Takizawa, Takeo ^{[1
]}

Hidaka, Chiharu ^{[1
]}

Nomura, Shigetaka

机构：

[1] Nihon Univ, Coll Humanities & Sci, Dept Phys, Setagaya Ku, Tokyo 1568550, Japan

来源：

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 10, NO 7-8 | 2013年 / 10卷 / 7-8期

关键词：

EPR; rare earth element; CaGa2S4; single crystal; PARAMAGNETIC-RESONANCE; LUMINESCENCE; SRGA2S4;

D O I：

10.1002/pssc.201200830

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

ESR measurements have been carried out to determine the local environment and the ground state of Ce3+ ions in the orthorhombic CaGa2S4 at 4.2 K. More than 30 ESR lines are observed with almost the same angular dependence. The local symmetry and the anisotropic g-tensor for the four strongest ESR signals indicate that Ce3+ ions substitute the three independent Ca sites. A part of Ce3+ ions at the Ca2+ sites and a neighbouring sulphur vacancy are expected to form complex centers in view of the other weak ESR lines observed. The ground state of Ce3+ in the host lattice is shown to consist of mostly phi (1/2) by fitting the ESR spectra using the spin Hamiltonian. The upper F-2(7/2) state is thought to be slightly mixed into the ground state F-2(5/2) judging from a small difference in the fitting.

引用

页码：1119 / 1122

页数：4

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