Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Small Polaron Hopping Conduction of n=3 Ruddlesden-Popper Compound La2.1Sr1.9Mn3O10 System

n=3인 Ruddlesden-Popper형 La2.1Sr1.9Mn3O10의 Small polaron Hopping 전도

  • Jung, Woo-Hwan (Division of Electrical, Electronic and Information Engineering, Howon University)
  • 정우환 (호원대학교 전기전자정보공학부)
  • Published : 2002.01.01
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Abstract

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.

다결정 층상 페로브스카이트형 $La_{2.1}Sr_{1.9}Mn_3O_{10}$를 성공적으로 합성하였으며, $La_{2.1}Sr_{1.9}Mn_3O_{10}$의 열기전력, 전기전도 및 자기적 특성을 조사하였다. 0.85T의 자장의 인가 시 자기전이 온도 $T_c$보다 매우 낮은 120K에서 금속-비금속전이 및 약 120%의 음의 $MR(-{\Delta}{\rho}/{\rho}_0)$이 관측되었다. 고온영역에서 small polaron의 특징중의 하나인 매우 큰 전기적 저항 및 열기전력의 활성화 에너지 차가 관측되었다. 전체적인 실험 결과는 small polaron hopping 모델로 설명가능 하였다.

Keywords

References

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