npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2019; 69: 1009-1015

Published online October 31, 2019 https://doi.org/10.3938/NPSM.69.1009

Copyright © New Physics: Sae Mulli.

Characterization of Mn$ ^{2+}$ Paramagnetic Impurity Center in PbWO$ _{4}$:Mn Single Crystal

Tae Ho YEOM*

Department of Laser and Optical Information Engineering, Cheongju University, Cheongju 28503, Korea

Correspondence to:thyeom@cju.ac.kr

Received: July 25, 2019; Revised: August 28, 2019; Accepted: August 28, 2019

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The electron paramagnetic resonance spectra of the Mn$ ^{2+}$ ion in a PbWO$ _{4}$:Mn single crystal taken in the crystallographic planes with an X-band spectrometer are analyzed using the effective spin Hamiltonian. Low symmetry effects are evidenced by the observed 180$ ^{\circ}$ rotational symmetry on the crystallographic planes of the Mn$ ^{2+}$ EPR center. The spectroscopic splitting parameter $g_{ij}$, the 2$ ^{\text{nd}}$ and the 4$ ^{\text{th}}$ order zero-field splitting parameter ($B_{2}^{q}, B_{4}^{q}$), and the hyperfine constants $A_{ij}$ of the Mn$ ^{2+}$ center show that the actual local site symmetry of the Mn$ ^{2+}$ impurity ion in a PbWO$ _{4}$ single crystal doped with Mn$ ^{2+}$ ions is monoclinic. The Mn$ ^{2+}$ impurity ion is seem to replace the Pb$ ^{2+}$ ion in the host PbWO$ _{4}$ crystal without any charge compensation. This monoclinic Mn$ ^{2+}$ EPR center turned out to be a new EPR center compared to the previous tetragonal impurity center.

Keywords: EPR, PbWO$ _{4}$:Mn crystal, Mn$ ^{2+}$ impurity ion, Local site symmetry, Substitutional site

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