Metal-like to insulator transition in Lu3Fe5O12 |
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Authors: | P. Manimuthu M.N. Jamal Ghousia Mariam R. Murugaraj C. Venkateswaran |
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Affiliation: | 1. Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai-600 025, India;2. Department of Physics, MIT Campus, Anna University, Chennai-600 044, India |
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Abstract: | Polycrystalline Lu3Fe5O12, prepared using the solid state reaction method, has Fe in the mixed valence state as inferred from the X-ray photoelectron spectroscopy. A spectral change in the impedance plot at 343 K is attributed to metal-like to insulator transition (MIT), which is analyzed in terms of localized and delocalized eg electrons. The change in the slope at 343 K in the DC conductivity plot also proves the MIT. The dependence of Z′ on temperature and Z″ on frequency clearly substantiates the presence of localized electrons up to 343 K and delocalized electrons above 343 K. |
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Keywords: | Rare earth iron garnet Lu3Fe5O12 Oxygen vacancy Electrical property Magnetic property |
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