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Hysteresis loss in Sm₁Ba₂Cu₃O_7-δ coated conductor with applied magnetic field and current varied in out-of phase

Jaeun Yoo

SangMoo Lee¹, YeHyun Jung¹, Kisung Kwak¹, Joonkyu Rhee¹, KookWon Han¹, Dung Nguyen¹, Dojun Youm¹, Hosup Kim², Hongsoo Ha², SangSoo Oh²

¹Department of Physics, KAIST, 305-701 Daejeon, Republic of Korea
²Superconducting Materials Research Group, KERI, 28-1, Seongju-dong, Changwon, 641-120, Republic of Korea
* phone: +82-42-350-2570, Fax: +82-42-350-2510,email:jaeunyoo@hotmail.com

The hysteresis loss in a Sm₁Ba₂Cu₃O_7-d coated conductor was estimated from magnetic field profiles measured by the scanning Hall probe method. Applied magnetic field (B_a ) and current (I_a ) were varied in a manner of out-of phase. The field profile data were measured while I_a were decreased stepwise from I_peak to -I_peak, and B_a was varied simultaneously from B_peak to -B_peak with 90 o phase difference with respect to I_a. The phase difference between B_a and I_a was kept constant during variation of B_a and I_a for this study. For maximum values of B_peak and I_peak, two load lines were selected with values of ∝ = I_a / B_a fixed; one was I_peak / B_peak = 80A / 200mT and the other was I_peak / B_peak = 120A/60mT. From the measured values of magnetic field profiles, the current profiles were calculated by the iterative inversion method. From the current profiles, the flux density profiles and the hysteresis loss, Q , were then calculated for various values of I_peak = ∝B_peak in each load line. The results were compared with theoretical calculations based on Brandt’s model.

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