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Title: Magnetic polaron conduction above the curie temperature in Fe-doped Pr0.75Sr0.25MnO3
Authors: Liu, J.-M.
Yu, T. 
Huang, Q.
Li, J. 
Shen, Z.X. 
Ong, C.K. 
Issue Date: 18-Feb-2002
Citation: Liu, J.-M., Yu, T., Huang, Q., Li, J., Shen, Z.X., Ong, C.K. (2002-02-18). Magnetic polaron conduction above the curie temperature in Fe-doped Pr0.75Sr0.25MnO3. Journal of Physics Condensed Matter 14 (6) : L141-L147. ScholarBank@NUS Repository.
Abstract: The transport behaviour of Fe-doped Pr0.75Sr0.25MnO3 (PSMFO, Fe = 0.05) is studied by zero-field conductivity probing and Raman spectroscopy. It is revealed that the conductivity of PSMFO above Tm, the metal-insulator transition point, shows variable-range-hopping behaviour instead of the small-polaron mode. The B2g Raman line at 630 cm-1 arising from the Mn-O bending and stretching modes undergoes anomalous softening as the temperature is lowered from ambient temperature, indicating a magnetic ordering sequence above Tm. It is demonstrated that the electronic conduction of PSMFO above Tm is governed by magnetic polarons embedded in a matrix of paramagnetic insulating phase.
Source Title: Journal of Physics Condensed Matter
ISSN: 09538984
DOI: 10.1088/0953-8984/14/6/102
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