supported by the National Natural Science Foundation of China,the National Basic Research Program of China (Grant Nos. 2006CB601000 and 2006CB921802);the Chinese Academy of Sciences Project (Grant No. ITSNEM)
Sr2VO3-δFeAs superconductors with different oxygen deficiencies have been successfully fabricated.It is found that the superconducting transition temperature drops down monotonically with the increase of nominal oxyg...