Prakash, J. ; Singh, S. J. ; Ahmed, J. ; Patnaik, S. ; Ganguli, A. K. (2009) Compositionally controlled semimetal to superconducting transition in NaF doped LaOFeAs: enhancement in Tc due to Na-doping Physica C: Superconductivity, 469 (7-8). pp. 300-304. ISSN 0921-4534
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.physc.2009.03.002
Abstract
We report the synthesis of LaOFeAs based oxypnictide superconductors (La1-xNaxO1-xFxFeAs) using sodium fluoride as a fluorinating agent. NaF doping leads to a systematic decrease in both the a and c lattice parameters. Resistivity measurements show the onset resistivity transition temperature at 30.9 (±0.05) K and corresponding Meissner transition at 28 (±0.05) K in La0.85Na0.15O0.85F0.15FeAs which is highest in LaOFeAs type superconductors synthesized at ambient pressure. Further increase of NaF content in LaOFeAs leads to suppression of Tc. The above superconductors show a negative value of the Seebeck coefficient which indicates that electrons are the dominant charge carriers.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Oxypnictides; Superconductivity |
| ID Code: | 91642 |
| Deposited On: | 23 May 2012 14:24 |
| Last Modified: | 23 May 2012 14:24 |
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