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Please use this identifier to cite or link to this item: http://hdl.handle.net/11178/4452

Title: MgB_2とHg1223超伝導体における磁化とスケーリング則(電気工学科,工学部創設40周年記念号)
Other Titles: Magnetization curves and the scaled J_c characteristics in MgB_2 and Hg1223 superconductors(DEPARTMENT OF ELECTRICAL ENGINEERING)
Authors: 小林, 広樹
阿久根, 忠博
坂本, 進洋
松本, 泰國
KOBAYASHI, Hiroki
AKUNE, Tadahiro
SAKAMOTO, Nobuyoshi
MATSUMOTO, Yasukuni
Luders, K.
Khan, H.R.
コバヤシ, ヒロキ
アクネ, タダヒロ
サカモト, ノブヨシ
マツモト, ヤスクニ
九州産業大学工学研究科電気工学専攻 / 九州産業大学電気工学科 / 九州産業大学電気工学科 / 福岡大学工学部電気工学科 / /
/ / / / Institut fur Experimentalphysik, Freie Universitat Berlin / Forschungsinstitut fur Edelmetalle und Metallchemie
Keywords: Magnetization curves
MgB_2
Ag-Hg1223
Scaling law
Issue Date: 20-Dec-2004
Publisher: 九州産業大学工学部
Abstract: From the shape of magnetization curves, the important superconduction characteristics can be evaluated. The critical current densities, the irreversibility fields and the losses of the superconductors can be estimated from hysteretic width, disappearance of the width and the area of the hysteresis loop, respectively. Magnetic field and temperature dependence of the pinning strength F_p in type-II superconductors is known to be well formalized by the scaling law of the pinning force as F_p = AH^^m_<c2>(B/B^<c2>)^γ(1 - B/B_^c2>)^δ, where H_<c2> is the upper critical field, γ, δ and m are the pinning parameters. In high temperature superconductors, the scaling law fails to describe the pinning properties since the irreversibility field B_<irr> is much smaller than the upper critical field B_<c2>. Conversion of field dependence term in the scaling law is accomplished by replacing the B_<c2> by the B_<irr>. The magnetization curves differentially computed using the scaled J_c with the pinning parameters of γ, δ and m show various shapes and can be fitted well to the observed curves of MgB_2 and Ag-Hg1223 superconductors in the wide range of temperature and magnetic field.
URI: http://hdl.handle.net/11178/4452
Appears in Collections:第41号

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