In situ fabrication of cobalt-doped SrFe2As2 thin films by using pulsed laser deposition with excimer laser

Eun-Mi Choi; Soon-Gil Jung; Nam Hoon Lee; Young-Seung Kwon; Won Nam Kang; Dong Ho Kim; Myung-Hwa Jung; Sung-Ik Lee; Liling Sun
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p062507
Academic Journal
The remarkably high superconducting transition temperature and upper critical field of iron (Fe)-based layered superconductors, despite ferromagnetic material base, open the prospect for superconducting electronics. However, success in superconducting electronics has been limited because of difficulties in fabricating high-quality thin films. We report the growth of high-quality c-axis-oriented cobalt (Co)-doped SrFe2As2 thin films with bulk superconductivity by using an in situ pulsed laser deposition technique with a 248 nm wavelength KrF excimer laser and an arsenic (As)-rich phase target. The temperature and field dependences of the magnetization showing strong diamagnetism and transport critical current density with superior Jc-H performance are reported. These results provide necessary information for practical applications of Fe-based superconductors.


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