Abstract
The carrier concentration of Tl2Ba2CaCu2O8 films was modified by annealing in N2 gas. X-ray analysis of the structure and the oxygen content revealed a correspondence between carrier concentration and oxygen depletion. The TC and nonlinear surface impedance was measured using a dielectric resonator and the nonlinearity slope parameter r=ΔXS/ΔRS was 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<p<0.195 holes/Cu, which does not include the optimal doping level of 0.16 holes/Cu.
Highlights
High temperature superconductor (HTS) thin films are used in passive microwave devices such as RF filters[1] and MRI pick-up coils[2]
The carrier concentration of Tl2Ba2CaCu2O8 films was modified by annealing in N2 gas
The starting material for these experiments comes from a large supply of 50 mm diameter Tl2Ba2CaCu2O8 thin films on LaAlO3 substrates, which presents a unique opportunity to conduct these experiments that may otherwise be prohibited by material supply limitations
Summary
High temperature superconductor (HTS) thin films are used in passive microwave devices such as RF filters[1] and MRI pick-up coils[2]. The carrier concentration of Tl2Ba2CaCu2O8 films was modified by annealing in N2 gas. The TC and nonlinear surface impedance was measured using a dielectric resonator and the nonlinearity slope parameter r= XS/ RS was found to converge to unity at the critical temperature, indicating a dominance of Josephson fluxon hysteresis on the nonlinearity.
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