| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1517669 | Journal of Physics and Chemistry of Solids | 2008 | 6 Pages |
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).
Related Topics
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Electronic, Optical and Magnetic Materials
Authors
S. Mollah, Z.A. Khan, D.K. Shukla, M. Arshad, Ravi Kumar, A. Das,