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

19 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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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.

In: Applied Physics Express, Vol. 8, No. 11, 113102, 11.2015.

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

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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.",

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AU - Pyon, Sunseng

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AU - Kobayashi, Ryo

AU - Watashige, Tatsuya

AU - Kasahara, Shigeru

AU - Matsuda, Yuji

AU - Shibauchi, Takasada

AU - Kitamura, Hisashi

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

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