Issue |
EPL
Volume 84, Number 6, December 2008
|
|
---|---|---|
Article Number | 67009 | |
Number of page(s) | 4 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/84/67009 | |
Published online | 12 January 2009 |
High-pressure study on LaFeAs(O
Fx) and LaFeAsO
with different Tc
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - Beijing 100190, PRC
Corresponding authors: llsun@aphy.iphy.ac.cn zhxzhao@aphy.iphy.ac.cn
Received:
28
September
2008
Accepted:
19
November
2008
We report studies on pressure dependence of superconducting transition temperature (Tc of
,
and
samples. In situ resistance measurements under high pressure showed that the
Tc of these three compounds increases
with pressure initially, reaches a maximum value and then decreases with further increasing
pressure, although Tc's at ambient
pressure are different. The onset Tc
of LaFeAsO
is ~ 50 K at
1.5 GPa, which is the highest record in La-based oxypnictide system. The significant
change in Tc induced by pressure
is attributed to the orbital degeneracy and the electron density of state at the Fermi level.
PACS: 74.70.-b – Superconducting materials / 62.50.-p – High-pressure effects in solids and liquids
© EPLA, 2008
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