Abstract
In the present work, the iron oxypnictide superconductor of the namely Nd 0.8Ba 0.2FeAsO 0.6F 0.4 is prepared with respect to the observation of distinct magnetization characteristics arising from both electron and hole doping. A magnetothermal phase diagram is given for the present iron oxypnictide system, based on the irreversibility fields ( H i r r ) and the upper critical fields ( H c 2 ) obtained from magnetotransport measurements, as well as the lower critical fields ( H c 1 ) evaluated by magnetization loops at various temperatures. High H c 2 ( 0 ) are revealed at low temperature range, which is in consistent with the observations of comparatively high critical current ( J c ) and the temperature dependent peak effect in the J c vs H curves.
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