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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(04) [April 2005] >
| Title: | Magnetic order and electrical resistance in manganites |
| Authors: | Singh, R J
Sharma, P K |
| Keywords: | Manganites
Electron paramagnetic resonance
Phase separations |
| Issue Date: | Apr-2005 |
| Publisher: | CSIR |
| IPC Code: | G01R27/02; H01F1/00 |
| Abstract: | The electrical
resistance versus temperature behaviour of the manganites La1-xBaxMnO3
(x=0.3,0.4,0.5); La1-xPbxMnO3 (x
= 0.2,0.3,0.33) and La1-xSrxMnO3 (x = 0.1,0.2,0.4) has been investigated.
The temperatures at which the substances have maximum resistance have been
found to be much lower than their Curie temperatures. The variation of
resistance with temperature is not smooth, but the graphs show different
slopes. The electron paramagnetic resonance of these substances shows a new
signal in the spectra on a little increase of microwave field from the usual
values. It has been interpreted as phase separations in the materials with Mn3+
and Mn4+ spins aligned in opposite directions. Based on this idea,
magnetic order and electrical resistance of the materials are shown to be
directly correlated. |
| Page(s): | 273-278 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(04) [April 2005]
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