Thermal Conductivity and Thermoelectric Power of Yb-Substituted Bi-2212 Superconductor

9th International Conference on Magnetic and Superconducting Materials

Gündomu, H.^1,2 ; Özçelik, B.^2 ; Sotelo, A.^3 ; Madre, M.A.^3

Faculty of Engineering, Hakkari University, Hakkari

30000, Turkey^1

Department of Physics, Faculty of Sciences and Letters, Çukurova University, Adana

01330, Turkey^2

ICMA (CSIC-Universidad de Zaragoza), María de Luna 3, Zaragoza

50018, Spain^3

关键词: As-grown;    Bi-2212;    Electrical resistivity measurements;    Laser floating zone;    Superconductor materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/667/1/012001/pdf
DOI  :  10.1088/1742-6596/667/1/012001

来源: IOP

【 摘 要 】

In the present study, Bi2Sr2CaCu2-xYbxO8+ywhere x = 0.0, 0.05, 0.1 and 0.25, superconductor materials were textured using the Laser Floating Zone technique. After annealing the as-grown materials, they were characterized by thermal conductivity (κ-T), thermoelectric power (S-T), and electrical resistivity (R-T) measurements performed from room temperature down to 20 K. The thermoelectric power is positive in all cases and is found to increase with decreasing temperature, reaching the maximum value (peak) around the samples TCvalues and dropping rapidly to zero below TC. Electrical resistivity measurements show a slight decrease of TCwhen Yb substitution is raised. In spite of this effect, TCvalues are higher than 90 K in all cases. On the other hand, Yb substitution also decreases thermal conductivity, compared with the undoped samples.