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第43号 >

Please use this identifier to cite or link to this item: http://hdl.handle.net/11178/4694

Title: MgB_2超伝導体の粒径と交流帯磁率特性(電気工学科)
Other Titles: AC susceptibility characteristics and particle size in MgB_2 superconductor(DEPARTMENT OF ELECTRICAL ENGINEERING)
Authors: 永山, 秀幸
阿久根, 忠博
坂本, 進洋
松本, 泰國
NAGAYAMA, Hideyuki
AKUNE, Tadahiro
SAKAMOTO, Nobuyoshi
ナガヤマ, ヒデユキ
アクネ, タダヒロ
サカモト, ノブヨシ
マツモト, ヤスクニ
九州産業大学工学部工学研究科電気工学専攻 / 九州産業大学工学部電気工学科 / 九州産業大学工学部電気工学科 / 福岡大学工学部電気工学科
Keywords: Double layer model
AC susceptibility
Double peaks
Issue Date: Dec-2006
Publisher: 九州産業大学工学部
Abstract: AC susceptibility x of MgB_2 superconductor particles with several particle sizes d were studied. MgB_2 showed symmetric and large magnetization and their susceptibility follows well with the theoretical results of the critical state model. In smaller size samples the values of x became smaller than the calculated value of the critical state model and in some cases double peaks in the imaginary x" and shoulders in the real x' appear. Double layer model is proposed in which the superconductor is composed of two regions with different superconducting characteristics, the surface and the residual inner layer. The magnetization and susceptibility are numerically computed following the critical state model and they show a variety of characteristics including the double peaks and the shoulders. The double layer model is successfully compared with the measurement of MgB_2. The depth of surface layer gets larger in the small size MgB_2 reflecting an improper composition condition.
URI: http://hdl.handle.net/11178/4694
Appears in Collections:第43号

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