Anomalous temperature dependence of the surface resistance of copper at 10 GHz

Effects of temperature on the surface resistance and volume resistivity of high-purity copper are investigated. The experimental investigation is based on accurate Q-factor measurements on a specially designed cavity resonator. Special experimental procedures were developed to yield the necessary accuracy. The results indicate an anomalous temperature variation of the surface resistance. The equivalent temperature coefficient of resistivity has a nonlinear temperature dependence.