Crucial influence of crystal site disorder on dynamical spectral response in artificial magnetoplumbites |
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| Institution: | 1. Moscow Institute of Physics and Technology (State University), Dolgoprudny, Moscow Region 141700, Russia;2. A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow 119991, Russia;3. 1. Physikalisches Institut, Universität Stuttgart, Stuttgart 70550, Germany;4. Faculty of Physics, Southern Federal University, Rostov on Don 344090, Russia;5. Southern Scientific Center of Russian Academy of Sciences, Rostov-on-Don 344006, Russia;6. Moscow Technological University - MIREA, Moscow 119454, Russia;1. Department of Technology, M. I. Platov South-Russian State Polytechnic University, 346428 Novocherkassk, Russian Federation;2. Department of Physics, Southern Federal University, 344006 Rostov-on-Don, Russian Federation;3. Universidade Federal de Minas Gerais, 31270-010 Belo Horizonte, Brazil;1. Department of Physics, Quaid-i-Azam University, Islamabad, Pakistan;2. Energy & Environmental Materials Division, Korea Institute of Ceramic Engineering & Technology, Jinju 52861, Republic of Korea;1. ICSM-UMR 5257 CNRS/CEA/UM2/ENSCM, Site de Marcoule, Bât. 426, BP 17171, 30207 Bagnols/Cèze, France;2. Forschungzentrum Jülich, Institute of Energy and Climate Research, Nuclear Waste Management and Reactor Safety (IEK-6), 52425 Juelich, Germany;1. Institute of Mathematics and Statistics - IME USP - University of São Paulo, Brazil;2. Johann Bernoulli Institute for Mathematics and Computer Science — University of Groningen, Netherlands;3. Department of Mathematics, Johann Bernoulli Institute for Mathematics and Computer Science — University of Groningen, Netherlands |
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| Abstract: | High quality PbFe12O19 single crystals were grown by a solution-melt crystallization technique and characterized by synchrotron radiation diffraction structural studies, Mössbauer, Raman and infrared spectral measurements. In the terahertz and sub-terahertz range two absorption bands are observed, which are associated with the dynamics of structurally disordered lead and iron ions. We develop a structural model that comprises Fe2+ ions at the (1/2 × 4e) (0, 0, z) position with bipyramidal oxygen environment, and Pb ions at the (24l) (x, y, z) position with generic strongly distorted 12 vertex polyhedron of oxygen. The atomic displacement ellipsoids of the oxygen surrounding the lead ion are stretched towards the Pb ion within the plane perpendicular to the hexagonal axis. The suggested model is in full agreement with the local symmetry of the Fe2 and Pb ions and with the chemical composition of the sample determined by X-ray analysis. |
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| Keywords: | Hexaferrites Magnetoplumbite Single crystal X-ray diffraction Terahertz-infrared spectroscopy |
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