Pinning properties of Y211 added cold top-seeded YBCO grown on Y2O3 layer

International Physics Conference at the Anatolian Peak 2016

Çakir, Bakiye^1,2 ; Duman, Seyda^3 ; Aydiner, Alev^1

Department of Physics, Faculty of Sciences, Karadeniz Technical University, Trabzon

61080, Turkey^1

Department of Elementary Education, Faculty of Education, Artvin Çoruh University, Artvin

08000, Turkey^2

Vocational School of Health Services, Artvin Çoruh University, Artvin

08000, Turkey^3

关键词: Arrhenius activation energy;    Effective activation energy;    Magnetization measurements;    Pinning force density;    Pinning properties;    Stoichiometric ratio;    Top seeding melt growths;    Vibrating sample magnetometer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/707/1/012034/pdf
DOI  :  10.1088/1742-6596/707/1/012034

来源: IOP

【 摘 要 】

In this study, samples having different composition were prepared with the cold top seeding-melt-growth (TSMG) process by using Nd123 seed. Y2O3buffer layer was placed to bottom of the pellets consist of Y123: Y211 powder mixtures. Two samples were fabricated in stoichiometric ratios of 1:0 and 1:0.4 labeled as Y0 and Y40, respectively. The Tc onset values of Y0 and Y40 were found to be 93.4 and 93.6 K at 0 T, respectively. The dependence of the effective activation energy U of the flux pinning on the magnetic field and temperature of the sample were determined using the Arrhenius activation energy law from the resistivity curves. The magnetization measurements were performed using a vibrating sample magnetometer (VSM) at 30, 50 and 77 K. The critical current densities (Jc) for Y0 and Y40 samples were determined to be 5.1×103and 3.7×103A/cm2at 77 K in 0 T, respectively. The normalized pinning force density versus the reduced field was examined at different temperatures to determine the pinning mechanism.