TY - JOUR
T1 - Enhancement of critical current density and mechanism of vortex pinning in H+-irradiated FeSe single crystal
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
N1 - Publisher Copyright:
© 2015 The Japan Society of Applied Physics.
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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U2 - 10.7567/APEX.8.113102
DO - 10.7567/APEX.8.113102
M3 - Article
AN - SCOPUS:84946601144
VL - 8
JO - Applied Physics Express
JF - Applied Physics Express
SN - 1882-0778
IS - 11
M1 - 113102
ER -