Charge ordering, magnetic, electrical transport and thermal transport properties of Nd0.75Na0.25MnO3 manganite

Z.Q. Li,X.H. Zhang, W.R. Li, W. Song,H. Liu, P. Wu,H.L. Bai,E.Y. Jiang

Physica B: Condensed Matter(2006)

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摘要
The electron diffraction patterns of Nd0.75Na0.25MnO3 were recorded at various temperatures. Superlattice reflection spots were observed below 170K, which provides direct evidence of an ordered arrangement of Mn3+ and Mn4+ cations in this compound at low temperature. By further analyzing the diffraction patterns, the Mn3+ and Mn4+ ions were found to form zigzag chains in the a–c plane of the orthorhombic lattice (space group Pnma). The magnetic, electrical-transport and thermal-transport properties of the compound were also studied. It is found that the specimen shows insulator-like characteristics in zero field, whereas a re-entrant ferromagnetic metal transition is observed when a strong magnetic field is applied. The ratio of the thermal conductivity to the electrical conductivity strongly deviates from the Wiedemann–Franz law, even in the ferromagnetic metallic state.
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75.47.Lx,75.47.Gk,75.30.Kz
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