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Adiabatic small polaron-hopping conduction in Ln0.85Ca0.15MnO3 (Ln=Nd, Pr and Sm) perovskites |
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| Authors: | S Mollah ZA Khan DK Shukla M Arshad Ravi Kumar A Das |
| Institution: | aDepartment of Physics, Aligarh Muslim University, Aligarh 202 002, India bInter-University Accelerator Centre, New Delhi, India cSolid State Physics Division, Bhabha Atomic Research Centre, Mumbai, India |
| Abstract: | Polycrystalline bulk ferromagnetic insulating (FMI) Ln0.85Ca0.15MnO3 (Ln=Nd, Pr and Sm) samples are prepared by standard solid-state reaction route and characterized. Powder X-ray diffraction (XRD) data of the manganites show single-phase character. Existing theoretical models predict that the high temperature (T>θD/2, θD being the Debye temperature) dc conductivity (σdc) of these samples is due to adiabatic small polaron-hopping conduction. Greaves’ and Mott's variable range hopping (VRH) conduction mechanisms are not suitable to explain the σdc data at low temperature (T<θD/2). |
| Keywords: | A Magnetic materials B Chemical synthesis C X-ray diffraction D Electrical conductivity |
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