Journal Article Enhancement of critical current density and mechanism of vortex pinning in H+-irradiated FeSe single crystal

Sun, Yue  ,  Pyon, Sunseng  ,  Tamegai, Tsuyoshi  ,  Kobayashi, Ryo  ,  Watashige, Tatsuya  ,  Kasahara, Shigeru  ,  Matsuda, Yuji  ,  Shibauchi, Takasada  ,  Kitamura, Hisashi

8 ( 11 )  , pp.113102-1 - 113102-4 , 2015-10 , IOP SCIENCE
We report a comprehensive study of the effect of H+ irradiation on the critical current density Jc and vortex pinning in an FeSe single crystal. The value of Jc for FeSe is enhanced by more than a factor of 2 after 3-MeV H+ irradiation, which is explained by the introduction of point pinning centers. Vortex creep rates are found to be strongly suppressed after irradiation. Detailed analyses of the pinning energy based on collective-creep-theory and an extended Maley's method show that the H+ irradiation enhances the value of Jc before the flux creep and also reduces the size of the flux bundle, which suppresses the field dependence of Jc owing to vortex motion.

Number of accesses :  

Other information