Krishnan, H. ; Srinivasan, R. ; Sankaranarayanan, V. ; Subramaniam, C. K. ; Rao, G. V. Subba (1991) Fluctuation-induced excess conductivity in the compounds CaREBaCu3O7-y (RE=La and Sm) Bulletin of Materials Science, 14 (3). pp. 747-752. ISSN 0250-4707
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Official URL: http://www.ias.ac.in/j_archive/bms/14/3/747-752/vi...
Related URL: http://dx.doi.org/10.1007/BF02744719
Abstract
The compounds CaREBaCu3O7-y (RE=La and Sm) are tetragonal at room temperature with Tc between 60 and 70 K. The single-phase compounds were prepared by solid-state reaction. The resistivity was measured by a four-probe technique in a continuous flow cryostat with the temperature being controlled to an accuracy of 10 mK. The resistivity vs temperature showed a break in slope around 180 K in CaLaBaCu3O7-y and around 220 K in CaSmBaCu3O7-y . The results were analysed for fluctuation conductivity from 180 K downwards. A plot of dp/dT vs T showed a sharp peak at Tm =69.69 K for La compound and 66.00 K for the Sm compound. Detailed analysis of the resistivity in the region Ton to 180 K was carried out using the procedure due to Veira and Vidal. The results are discussed in this paper.
Item Type: | Article |
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Source: | Copyright of this article belongs to Indian Academy of Sciences. |
Keywords: | High Tc Superconductors; CaREBaCu3O7-y; Fluctuation; Excess Conductivity |
ID Code: | 57934 |
Deposited On: | 30 Aug 2011 10:23 |
Last Modified: | 18 May 2016 09:09 |
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