Phys. Rev. Lett. 84, 4481–4484 (2000)Low Temperature Anomaly in Mesoscopic Kondo WiresReceived 27 April 1998; revised 19 January 2000; published in the issue dated 8 May 2000 We report the observation of an anomalous magnetoresistance in extremely dilute quasi-one-dimensional AuFe wires at low temperatures, along with a hysteretic background at low fields. The Kondo resistivity does not show the unitarity limit down to the lowest temperature, implying uncompensated spin states. We suggest that the anomalous magnetoresistance may be understood as the interference correction from the accumulation of geometric phase in the conduction electron wave function around the localized impurity spin. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.4481
DOI:
10.1103/PhysRevLett.84.4481
PACS:
75.20.Hr, 73.23.-b, 03.65.Bz
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