Prakash, J. ; Singh, S. J. ; Samal, S. L. ; Patnaik, S. ; Ganguli, A. K. (2008) Potassium fluoride doped LaOFeAs multi-band superconductor: evidence of extremely high upper critical field EPL: Europhysics Letters, 84 (5). 53003_1-57003_5. ISSN 0295-5075
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Official URL: http://iopscience.iop.org/0295-5075/84/5/57003
Related URL: http://dx.doi.org/10.1209/0295-5075/84/57003
Abstract
The recently discovered superconductors based on oxypnictides have rekindled the search for new non-copper based high-Tc superconductors. After the initial report by Kamihara et al. of superconductivity in (La-O/F-Fe-As)-based compounds, there have been several reports on these new superconductors but the synthesis of pure phases of these oxypnictides has remained a challenge. Here we describe a new methodology of synthesizing these oxypnictide superconductors with the commonly available potassium fluoride (KF) as a source of fluorine instead of the expensive LaF3. This route also allows the substitution of potassium at lanthanum sites which leads to an increase in the upper critical field as would be expected for a multi-band superconductor. We also report the highest-Tc (onset) of 28.50 K and highest upper critical field at ambient pressure in the family of La-based oxypnictides.
Item Type: | Article |
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Source: | Copyright of this article belongs to EDP Sciences. |
ID Code: | 91646 |
Deposited On: | 23 May 2012 14:20 |
Last Modified: | 23 May 2012 14:20 |
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