POWER DEPENDENCE OF HTS DISK-RESONATOR QUALITY FACTOR

The simple closed-form model of nonlinear response of a high-temperatu re superconducting disk resonator on microwave power is proposed. The model is based on superconducting film nonlinearity and describes the dependence of unloaded quality factor on the incident power. The speci fied normalizing power is used as the only fitting parameter. Good qua ntitative agreement of modeled and measured data has been obtained. Th e results observed exhibit the kinetic nature of the nonlinearity of t he disk resonator on an LaAlO3 substrate at T = 60 K and more complica ted, presumably thermal, heating nature of the nonlinearity at lower t emperature.