Variable range hopping conductivity in manganites |
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| Authors: | YuKh Vekilov YaM Mukovskii |
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| Institution: | 1. School of Physics, University of Hyderabad, Gachibowli, Hyderabad 500046, Telangana, India;2. Department of Physics, Indian Institute of Science, Bangalore 560012, Karnataka, India;1. Department of Physics, Faculty of Science, Jouf University, Sakaka, Saudi Arabia;2. Laboratoire de Physique Appliquée, Faculté des Sciences de Sfax, Université de Sfax, B.P 1171, Sfax, 3000, Tunisia;1. School of Mathematics and Physics, Changzhou University, Changzhou 213164, People’s Republic of China;2. Department of Microelectronics, State Key Laboratory of ASIC and Systems, Fudan University, Shanghai 200433, People’s Republic of China;3. Shaanxi Key Laboratory of Condensed Matter Structures and Properties, School of Science, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China;1. Materials Science and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum, India;2. Academy of Scientific and Innovative Research (AcSIR), CSIR, Trivandrum, India;1. Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur, West Bengal 721 302, India;2. Experimental Condensed Matter Physics Division, Saha Institute of Nuclear Physics, West Bengal, India;3. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India |
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| Abstract: | The nature of variable range hopping (VRH) conductivity which is observed in the insulating state of doped rare-earth manganites with perovskite structure is considered in the two component model of metallic-like droplets embedded in dielectric matrix. When the density of the metallic droplets is less than the percolation limit, the system falls into the insulating state with VRH conductivity defined by inter granular tunneling and electrostatic barriers. With temperature increasing the VRH regime is transforming into the hopping regime of small radius polarons. |
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