Please use this identifier to cite or link to this item: https://doi.org/10.1039/c8ra08694j
Title: Influence of magnetic field on electrical and thermal transport in the hole doped ferromagnetic manganite: La 0.9 Na 0.1 MnO 3
Authors: Das, R. 
Chanda, A. 
Mahendiran, R. 
Issue Date: 2019
Publisher: Royal Society of Chemistry
Citation: Das, R., Chanda, A., Mahendiran, R. (2019). Influence of magnetic field on electrical and thermal transport in the hole doped ferromagnetic manganite: La 0.9 Na 0.1 MnO 3. RSC Advances 9 (3) : 1726-1733. ScholarBank@NUS Repository. https://doi.org/10.1039/c8ra08694j
Rights: Attribution-NonCommercial 4.0 International
Abstract: We report the magnetization (M), magnetostriction, electrical resistivity (?), thermal conductivity (?) and thermopower (S) of polycrystalline La 0.9 Na 0.1 MnO 3 over a wide temperature range of 5 to 360 K. This sample undergoes a paramagnetic to ferromagnetic transition around T C = 274 K and electrical resistivity ? shows an insulator-metal transition around T IM = 292 K. The sign of thermopower S is positive in the entire temperature range which indicates that majority charge carriers are holes. Thermopower exhibits a peak and thermal conductivity shows a dip at T C in the absence of magnetic field. Large difference between the experimentally determined activation energies of ? and S in the insulating state indicates small polaron hopping dominant conduction above T IM . Polaron formation above T C , was further confirmed from the anomaly observed in thermal expansion (?L/L 0 ) which shows a change in slope at T IM . In the vicinity of T C at 3 T applied field, magneto-thermopower (?61.5%) is larger than magnetothermal conductivity (?12.7%) and magnetoresistance (?49%). © The Royal Society of Chemistry.
Source Title: RSC Advances
URI: https://scholarbank.nus.edu.sg/handle/10635/213725
ISSN: 20462069
DOI: 10.1039/c8ra08694j
Rights: Attribution-NonCommercial 4.0 International
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