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

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

doi:10.7567/APEX.8.113102

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

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

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

We report a comprehensive study of the effect of H⁺ irradiation on the critical current density J_c 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 collectivecreep-theory and an extended Maley's method show that the H⁺ irradiation enhances the value of J_c before the flux creep and also reduces the size of the flux bundle, which suppresses the field dependence of J_c owing to vortex motion.

Original language	English
Article number	113102
Journal	Applied Physics Express
Volume	8
Issue number	11
DOIs	https://doi.org/10.7567/APEX.8.113102
Publication status	Published - Nov 2015
Externally published	Yes

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Enhancement of critical current density and mechanism of vortex pinning in H+-irradiated FeSe single crystal",

abstract = "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 collectivecreep-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.",

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

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AU - Sun, Yue

AU - Pyon, Sunseng

AU - Tamegai, Tsuyoshi

AU - Kobayashi, Ryo

AU - Watashige, Tatsuya

AU - Kasahara, Shigeru

AU - Matsuda, Yuji

AU - Shibauchi, Takasada

AU - Kitamura, Hisashi

PY - 2015/11

Y1 - 2015/11

N2 - 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 collectivecreep-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.

AB - 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 collectivecreep-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.

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

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