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Journal of the Korean Ceramic Society 1998;35(8): 885. |
| ${(LaMn) }_{1-λ }O }_{3 }$의 전기전도 및 자기적 특성 |
| 정우환 |
| 전북산업대학교 전자공학과 |
| Electrical Transport and Magnetic Properties in ${(LaMn) }_{1-λ }O }_{3 }$ |
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| ABSTRACT |
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The temperature dependence of dc conductivity and magnetic properties of cation deficient {{{{ { {(LaMn) }_{1-λ }O }_{3 } }} systems has been investigated,. Above 160K the magnetic susceptibility of all samples followed the Curie-Weiss law. The Curie temperature decreased as the cation deficiency increased. This is due to a strong Jahn-Teller effect originated from electrons of {{{{ { Mn}^{3+ } }} In the case of samples annealed in air and oxygen at-mosphere the charge carriers responsible for conduction in the ferromagnetic regime below the Curie tem-perature are believed to have both magnetic and lattice characteristics. However the conduction carriers in the paramagnetic regime above the Curie temperature are though to be formed by hopping process of small polarons which were generated by assistance of the Jahn-Teller effect. |
| Key words:
Antiferromagnetic, Jahn-Teller effect, Spin polaron, Small polaron, Superexcehange interaction |
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