Volume 84, Number 5, December 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 November 2008|
Potassium fluoride doped LaOFeAs multi-band superconductor: Evidence of extremely high upper critical field
Department of Chemistry, Indian Institute of Technology - New Delhi, 110016 India
2 School of Physical Sciences, Jawaharlal Nehru University - New Delhi, 110067 India
Accepted: 21 October 2008
The recently discovered superconductors based on oxypnictides have rekindled the search for new non-copper based high- superconductors. After the initial report by Kamihara et al. of superconductivity in (La-OF-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- (onset) of 28.50 K and highest upper critical field at ambient pressure in the family of La-based oxypnictides.
PACS: 74.70.-b – Superconducting materials / 74.10.+v – Occurrence, potential candidates
© EPLA, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.