Volume 83, Number 1, July 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 June 2008|
Superconductivity and phase diagram in iron-based arsenic-oxides ReFeAsO (Re = rare-earth metal) without fluorine doping
National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - P.O. Box 603, Beijing 100190, PRC
Accepted: 12 May 2008
Here we report a new class of superconductors prepared by high-pressure synthesis in the quaternary family ReFeAsO (Re = Sm, Nd, Pr, Ce, La) without fluorine doping. The onset superconducting critical temperature (Tc) in these compounds increases with the reduction of the Re atom size, and the highest Tc obtained so far is 55 K in SmFeAsO. For the NdFeAsO compound with different oxygen concentration a dome-shaped phase diagram was found.
PACS: 74.10.+v – Occurrence, potential candidates / 74.70.-b – Superconducting materials
© EPLA, 2008
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