NANO-SCALE FRICTION: KINETIC FRICTION OF MAGNETIC FLUX QUANTA AND CHARGE-DENSITY WAVES

摘要

In analogy with the standard macroscopic friction [1], here we present a comparative study of the friction force felt by moving vortices in superconductors and charge density waves [2]. First of all, we show that driven quantized magnetic vortex lattice in high-temperature cuprate a superconductor is a very good model system for investigating physics of friction of solid. Based on the dc I -V characteristic measurement and viscosity measurement using microwave techniques in a high-T{sub}c superconductor, LSCO, the corresponding kinetic friction, F{sub}k, was obtained as functions of temperature (7), magnetic field (H) and velocity (v). With increasing H and T, v-dependence of F{sub}k changed systematically in a reproducible manner. Thus, we can control F{sub}k, and that systematic experiments are available in a reproducible manner with using this system.