Hole Concentration Effect on the Microwave Nonlinearity of Tl2Ba2CaCu2O8±δ Superconducting Thin Films

11th European Conference on Applied Superconductivity

Bischak, M.M.^1 ; Thomas, J.^1 ; Philip, R.R.^2 ; Remillard, S.K.^1

Hope College, 27 Graves Place, Holland

MI

49423, United States^1

Thin Film Research Lab, UC College, Aluva, Cochin, Kerala, India^2

关键词: Concentration effects;    Critical temperatures;    Doping levels;    Nonlinear surface impedance;    Optimal doping;    Oxygen content;    Oxygen depletion;    Slope parameter;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/1/012042/pdf
DOI  :  10.1088/1742-6596/507/1/012042

来源: IOP

【 摘 要 】

The carrier concentration of Tl2Ba2CaCu2O8films was modified by annealing in N2gas. X-ray analysis of the structure and the oxygen content revealed a correspondence between carrier concentration and oxygen depletion. The TCand nonlinear surface impedance was measured using a dielectric resonator and the nonlinearity slope parameter r=ΔXS/ΔRSwas found to converge to unity at the critical temperature, indicating a dominance of Josephson fluxon hysteresis on the nonlinearity. Highly inductive nonlinearity was observed in a small range of doping levels between 0.180