Volume 84, Number 6, December 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 January 2009|
High-pressure study on LaFeAs(OFx) and LaFeAsO with different Tc
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - Beijing 100190, PRC
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
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.