| n=3인 Ruddlesden-Popper형 La2.1Sr1.9Mn3O10의 Small polaron Hopping 전도 |
| 정우환 |
| 호원대학교 전기전자정보공학부 |
| Small Polaron Hopping Conduction of n=3 Ruddlesden-Popper Compound La2.1Sr1.9Mn3O10 System |
| Woo-Hwan Jung |
| Division of Electrical, Electronic and Information Engineering, Howon University |
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| ABSTRACT |
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Polycrystalline $La_{2.1}Sr_{1.9}Mn_3O_{10}$ with layered perovskite structure have been successfully synthesized and investigated with respect to their thermoelectric, electric and magnetic properties. The large magnetoresistance (MR) effect with $-{Delta}{rho}/{rho}_0$ of ∼120% at 0.85T was observed in a wide temperature range below a cusp temperature in resistivity of about 120K, which is well below the magnetic $T_C$. At high temperature, a singnificant difference between the activation energy deduced from the electrical resistivity and thermoelectric power, a characteristic of small polaron, is observed. All of the experimental data can be well explained on the basis of the small polaron model. |
| Key words:
Hopping, Jahn-Teller effect, Ruddlesden-Popper, Small polaron, Thermoelectric power |
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