Novel phase modulation of magnetoresistance oscillations in Kondo/superconducting hybrid loops

Abstract

Low temperature transport measurements have been performed for Kondo AuFe/superconducting hybrid loops. For both 26-ppm-AuFe/Al loop and 70-ppm-AuFe/Al loop, magnetoresistance shows AharonovBohm type oscillation with a period corresponding to the superconducting flux quantum. The phase of the oscillations can be modulated by applying do bias current through the samples. However, phase shift by the do current is so effective that only 26-muA-current can induce 2pi change. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.