Low temperature microwave impedance of aluminum in orthogonal magnetic field

Abstract

The real part of surface low temperature impedance of aluminum and copper is analyzed on the base of the data on measurement of Q-factor for coaxial resonator. Microwave impedance (decimeter wave length range) have been tested under an action of strong magnetic field. Temperature range expands from liquid helium point to liquid nitrogen and up to room these. Non-monotonic behaviour of Q-factor in the function of magnetic field for resonator made of pure Al is observed and discussed as quasiresonance absorption of field energy by special noncentral electron group of isoenergetic sufrace. The approximation of the free electron dispertion law is attracted to speculate the negativity of surface magnetoresistance of aluminum.