ANGULAR-DEPENDENCE OF UNIVERSAL CONDUCTANCE FLUCTUATIONS IN NOBLE-METAL NANOWIRES

We investigate fluctuations in the magnetoconductance (measured at T a pproximate to 50 mK) of noble-metal nanowires in a mesoscopic two-lead configuration, with lengths 500 and 1000 nm and widths w between 45 a nd 360 nm. We determine the dependence of the correlation field B-c on the angle theta between the direction of the magnetic held and the lo ng; axis of the wires, theta is changed at low T continuously from 90 degrees (usual geometry) to 0 degrees. We present a calculation taking into account the 3D diffusive motion of the conduction electrons desc ribing the angular dependence of B-c, We compare this B-c(theta) depen dence with conductance fluctuations observed while sweeping theta at c onstant magnetic field.