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Enhancement of critical current density and mechanism of vortex pinning in H+-irradiated FeSe single crystalEnhancement of critical current density and mechanism of vortex pinning in H+-irradiated FeSe single crystal |
"/Sun, Yue/"Sun, Yue ,
"/Pyon, Sunseng/"Pyon, Sunseng ,
"/Tamegai, Tsuyoshi/"Tamegai, Tsuyoshi ,
"/Kobayashi, Ryo/"Kobayashi, Ryo ,
"/Watashige, Tatsuya/"Watashige, Tatsuya ,
"/Kasahara, Shigeru/"Kasahara, Shigeru ,
"/Matsuda, Yuji/"Matsuda, Yuji ,
"/Shibauchi, Takasada/"Shibauchi, Takasada ,
"/Kitamura, Hisashi/"Kitamura, Hisashi
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, pp.113102-1
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113102-4 , 2015-10 , IOP SCIENCE
ISSN:1882-0778
内容記述
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.
