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http://nopr.niscpr.res.in/handle/123456789/26998| Title: | Effect of External and Internal Pressures on the Insulator-metal Transition Temperature of the Colossal magneto-resistive Materials |
| Authors: | Sen, Vikram Panwar, Neeraj Singhal, S K Singh, B P Agarwal, S K |
| Issue Date: | Dec-2004 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | We have studied the effect of external pressure (10-40Kbar) and internal pressure on the conduction mechanism of Pr2/3Ca1/3MnO3 colossal magneto-resistive materials. Pr2/3Ca1/3MnO3 is an insulator at low temperatures and on applying external pressure above 10Kbar there is a plateau in resistivity at 115K temperature, giving indications of an insulator-metal transition. Similar indications are also seen at 113K on replacing Mn+3 by Fe+3 in Pr2/3Ca1/3MnO3. Such a behaviour of Pr2/3Ca1/3MnO3 and Pr2/3Ca1/3FeO3 has been explained on the basis of competition between double exchange and super-exchange mechanisms. |
| Page(s): | 247-248 |
| ISSN: | 0975-2412 (Online); 0771-7706 (Print) |
| Appears in Collections: | BVAAP Vol.12(2) [December 2004] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| BVAAP 12(2) 247-248.pdf | 381.49 kB | Adobe PDF | View/Open |
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