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https://doi.org/10.3938/NPSM.68.1293
The Superconducting Properties of a High-Temperature Superconducting GdBCO-Coated Conductor
New Phys.: Sae Mulli 2018; 68: 1293~1301
Published online December 31, 2018;  https://doi.org/10.3938/NPSM.68.1293
© 2018 New Physics: Sae Mulli.

Seok Han YANG, Kyu Jeong SONG*

Division of Science Education (Physics) and Institute of Science Education, Chonbuck National University, Jeonju 54896, Korea
Correspondence to: songkj@jbnu.ac.kr
Received October 2, 2018; Revised October 17, 2018; Accepted October 17, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The basic magnetic properties of commercially available High-$T_c$ Superconductor (HTS) GdBCO-coated conductor (GdBCO-CCs) were investigated by using physical property measurement system-vibrating sample magnetometer (PPMS-VSM). From the zero-field-cooled (ZFC) $m(T)$ curve, the $T_c$ was found to be $\sim$93 K. After removing the background $m(H)$ data, we obtained both the net $m(H)$ data and the $\Delta m_{irr}$. The $H_{irr}(T)$ coincided very well with the power-law relation $H_{irr} = H_{irr}(0)(1-T/T_c)^n$ with $n \cong 1.19$. The magnetic flux behavior was investigated by using the $\delta$ values in the relationship $J_c \propto \Delta m_{irr} \propto H^{-\delta}$. A $\delta \approx 0$ region denoting an independent magnetic flux pinning effect, a $\delta \approx 0.6 \sim 1.2$ region representing a collective flux pinning effect due to the interaction, and a $\delta \gg 2$ region representing freely moving magnetic fluxes caused by the Lorentz force were observed. The boundary line between $\delta \approx 0$ and $\delta \approx 0.6 \sim 1.2$ is denoted by a $H_1$, and the one between $\delta \approx 0.6 \sim 1.2$ and $\delta \gg 2$ is denoted by a $H_2$. The $\delta(T)$ was obtained in the region of $H_1 < H < H_2$. As the temperature was decreased, the $\delta$ value gradually decreased.
PACS numbers: 74.25.Ha, 74.25.-q, 74.25.Sv, 74.72.-h, 74.90.+n
Keywords: GdBCO-coated conductor, Irreversibility field, Characteristic field, Irreversibility magnetic moment, Indicated physical quantity $\delta$


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