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Intrinsic and extrinsic transport properties of Pr(0.67)Ba(0.33)MnO(3):Ag(2)O composites

Author:
Panwar, Neeraj  Coondoo, Indrani  Singh, R. S.  Agarwal, S. K.  


Journal:
JOURNAL OF ALLOYS AND COMPOUNDS


Issue Date:
2010


Abstract(summary):

We have studied the electrical resistivity, magnetoresistance (MR), and specific heat of (1 - x) Pr(5.62)Ba(0.33)MnO(3):xAg(2)O (x = 0-30 mol% Ag(2)O) composite manganites. Two insulator-metal-like transitions (T(P1) similar to 194 K and T(P2) similar to 160 K) are observed in the electrical resistivity behaviour of the pristine material Pr(0.62)Ba(0.33)Mn(O3) (PBMO). With Ag(2)O addition, T(P1) becomes sharper whereas T(P2) disappears beyond 25 mol% Ag(2)O addition. Electrical resistivity also decreases in the composites in the whole temperature range of measurement. Intrinsic MR (due to grain) gets enhanced from 22% for the pure sample to similar to 40% for 30% Ag(2)O sample with 0.6T field. Extrinsic MR (due to grain boundary), however, is found to decrease with Ag(2)O addition. Peak MR enhances in composite at the same temperature and at low temperature, beyond the peak, it is almost constant in a large temperature window. Anomaly observed in the specific heat (C(P)) near the high temperature insulator-metal transition temperature for various samples signifies the onset of magnetic ordering. Also C(P) vs T trend is similar in all the samples indicating that Ag(2)O addition does not produce any magnetic inhomogeneity. (C) 2010 Elsevier B.V. All rights reserved.


Page:
439---442


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