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Structural, magnetic and transport properties of Ca and Sr doped Lanthanum manganites |
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| รหัสดีโอไอ | |
| Creator | Sunita KESHRI |
| Title | Structural, magnetic and transport properties of Ca and Sr doped Lanthanum manganites |
| Contributor | Shailendra RAJPUT, Sonali BISWAS, Leena JOSHI, Wojciech SUSKI, Piotr WI?NIEWSKI |
| Publisher | Metallurgy and Materials Science Research Institute Chulalongkorn University |
| Publication Year | 2564 |
| Journal Title | Journal of Metals, Materials and Minerals |
| Journal Vol. | 31 |
| Journal No. | 4 |
| Page no. | 62-68 |
| Keyword | Manganite, Resistivity, M-I transition, Magnetization, Thermoelectric power |
| ISSN | 0857-6149 |
| Abstract | This article presents a comparative study for the effect of average A-site cation size on the structural, transport and magnetic properties of Lanthanum manganites. Three polycrystalline colossal magneto-resistive compounds were synthesized using standard solid state reaction method. The electrical resistivity data were analyzed employing standard two-phase model to understand the conduction mechanism. The resistance of polycrystalline ceramic depends on the intragrain resistance (intrinsic resistance) and the intergrain or grain-boundary resistance (extrinsic resistance). The substitution of Sr ions at La-site provides higher magnetic and metal-insulator transitions as compared to Ca ions. The combined substitution of Ca and Sr ions at La-site offers nearby room temperature magnetic and metal-insulator transitions. Irreversibility in the temperature dependent DC magnetization is observed in the zero-field-cooled and field-cooled measurements. It is noticed that the larger average radius of the A-site cations possesses higher magnetic and metal-insulator transition temperatures. Temperature dependent thermoelectric power curves show a hump like behavior, which indicates a smooth transition from the low-temperature metallic behavior to high-temperature semiconductor-like behavior. |
