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Magnetic Property of the High-Temperature Superconductor GdBCO Coated Conductor
New Physics: Sae Mulli 2017; 67: 1264~1271
Published online November 30, 2017;
© 2017 New Physics: Sae Mulli.

Byung Du PARK, Kyu Jeong SONG*

Division of Science Education (Physics) and Institute of Science Education, Chonbuck National University, Jeonju 54896, Korea
Correspondence to:
Received September 29, 2017; Revised October 13, 2017; Accepted October 13, 2017.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The basic electrical and magnetic superconducting properties of the commercially available High-Temperature Superconductor (HTS) GdBCO coated conductor (CC) specimens were investigated by using both a four-probe method and a magnetometer magnetization method with a physical property measurement system (PPMS). The $H_{irr}(T)$ data in the region near the superconducting temperature $T_c$ coincided very well with the power-law relation $H_{irr}$ = $H_{irr}(0)(1-T/T_{c})^{n}$. Similarly, the $H_{c2}(T)$ data agreed well with the Bardeen, Cooper, and Schrieffer (BCS) type function $H_{c2}$ = $H_{c2}(0)[1-(T/T_{c})^{\alpha}]^{\beta}$ in the region near the $T_c$. On the other hand, the irreversible magnetic moment $\Delta m_{irr}$ was obtained by measuring the magnetic moment $m(H)$. The Bean model was applied to obtain the related superconducting current density, $J_c$, of the GdBCO CC. The magnetic flux behavior was investigated from the relationship $J_c \propto H^{-\delta}$. At temperatures near $T_c$, the value of $\delta$ when the magnetic field was parallel to the ab-plane of the specimen was two times greater than the value of $\delta$ when it was parallel to the c-axis, but the difference between the $\delta$ values gradually decreased as the temperature was decreased.
PACS numbers: 74.25.-q, 74.25.F-, 74.25.Ha, 74.72.-h, 74.78.-w
Keywords: GdBCO-coated conductor, Irreversibility field, Upper critical field, Irreversibility magnetic moment, Critical current density, Giant flux creep

March 2018, 68 (3)
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