An EPR study of Cr3+ centres having monoclinic symmetry in TlZnF3 single crystals

• Published in: Journal of physics. Condensed matter Vol. 20; no. 14; pp. 145202 - 145202 (7)
• Main Authors: Ebisu, H, Arakawa, M, Takeuchi, H
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 09.04.2008; Institute of Physics
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electron paramagnetic resonance and relaxation; Exact sciences and technology; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Physics; Vacancies; Thallium Zinc Fluorides Mixed; F centers; Doping; Chromium additions; Bond lengths; Fine structure; Monocrystals; Impurities; Spin Hamiltonians; Angular variation; Electron paramagnetic resonance; E centers
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/20/14/145202

EPR measurements have been made on as-grown single crystals of TlZnF3 doped with chromium. From Cr-only-doped crystals, two types of Cr3+ spectra with monoclinic symmetry were observed together with three kinds of Cr3+ spectra with trigonal symmetry which has been reported in our previous work (Ebisu et al 2005 J. Phys.: Condens. Matter 17 4653-63). The obtained fine structure parameters for the monoclinic spectra are analysed using the spin-Hamiltonian separation method. Each monoclinic spectrum is ascribed to a Cr3+ ion, respectively, at a Zn2+ ion site in a ZnF6 unit or a Zn2F9 unit with a Tl+ vacancy. Distortions of the ligand octahedra are discussed using the separated axial parameters.