Issue |
EPL
Volume 84, Number 5, December 2008
|
|
---|---|---|
Article Number | 57003 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/84/57003 | |
Published online | 27 November 2008 |
Potassium fluoride doped LaOFeAs multi-band superconductor: Evidence of extremely high upper critical field
1
Department of Chemistry, Indian Institute of Technology - New Delhi, 110016 India
2
School of Physical Sciences, Jawaharlal Nehru University - New Delhi, 110067 India
Corresponding authors: spatnaik@mail.jnu.ac.in ashok@chemistry.iitd.ernet.in
Received:
15
July
2008
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-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-
(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
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