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 (II)

n=3인 Ruddlesden-Popper형 La2.1Sr1.9Mn3O10 세라믹스의 Small polaron Hopping 전도 (II)

  • Jung, Woo-Hwan (Division of Electrical, Electronic and Information Engineering, Howon University) ;
  • Lee, Joon-Hyung (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Sohn, Jeong-Ho (School of Gem and New Materials Engineering, Kaya University)
  • 정우환 (호원대학교 전기전자정보공학부) ;
  • 이준형 (경북대학교 무기재료공학과) ;
  • 손정호 (가야대학교 보석신소재공학과)
  • Published : 2002.01.01
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Abstract

Electrical resistivity and thermoelectric power measurements on Mn-based $La_{2.1}Sr_{1.9}Mn_3O_{10}$ with layered perovskite structure as functions of temperature are presented. The experimental results demonstrate that the electronic transport in $La_{2.1}Sr_{1.9}Mn_3O_{10}$ is well described by the Emin-Holstein adiabatic small polaron model. The thermoelectric power data in the small polaron regime above Curie temperature is nearly equal to that predicted by nominal $Mn^{4+}$ valence arguments. This indicates that transport involves small polaron hopping.

Mn계 층상 perovskite 세라믹스 $La_{2.1}Sr_{1.9}Mn_3O_{10}$의 전기저항 및 열기전력의 온도의존성을 측정하였다. 실험결과 $La_{2.1}Sr_{1.9}Mn_3O_{10}$의 전기전도는 Emin-Holstein의 단열 small polaron model에 의하여 이루어지고 있었다. Curie 온도이상의 small polaron hopping 영역에서의 열기전력 측정결과는 이론적인 $Mn^{4+}$ 가전자 관점에서 예측되었던 열기전력 측정 결과와 거의 동일하였다. 이 실험결과 역시 $La_{2.1}Sr_{1.9}Mn_3O_{10}$ 세라믹스의 전기전도가 small polaron에 의하여 이루어지고 있음을 의미한다.

Keywords

References

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