Critical temperature and critical current density of hydrogen-doped SmFeAsO epitaxial films fabricated by thermal annealing with binary hydrides

Four kinds of binary hydrides (MgH2, CaH2, SrH2, and BaH2) were added to evacuated silica-glass ampules containing undoped SmFeAsO epitaxial films. Post-deposition thermal annealing was performed to dope hydrogen into the films. The annealing temperature was optimized for each hydride. Critical temperatures of >40 K and critical current densities (J(c)) >= similar to 1 MA cm(-2)at 2 K and a self-field were observed in the hydrogen-doped films annealed with CaH2, SrH2, and BaH2. This result would lead to acceleration of biaxially textured coated conductor researches on hydrogen-doped SmFeAsO exhibiting high-J(c)performance for high-field magnet application.