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Low temperature anomaly in mesoscopic kondo wires
1Condensed Matter Physics 114-36, California Institute of Technology, Pasadena, California 91125, USA.
Physical Review Letters
|September 16, 2000
Summary
We observed anomalous magnetoresistance in gold-iron (AuFe) wires, suggesting localized impurity spins affect electron wave functions. This Kondo resistivity indicates uncompensated spins, crucial for understanding quantum phenomena in nanoscale materials.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Understanding electron behavior in low-dimensional systems is key.
- Kondo effect in dilute magnetic alloys is a significant area of research.
- Anomalous magnetoresistance phenomena require further investigation.
Purpose of the Study:
- To investigate anomalous magnetoresistance in quasi-one-dimensional AuFe wires.
- To explore the implications of Kondo resistivity and uncompensated spins.
- To propose a theoretical explanation for the observed magnetoresistance.
Main Methods:
- Fabrication of extremely dilute quasi-one-dimensional AuFe wires.
- Low-temperature electrical transport measurements.
- Magnetic field application to observe magnetoresistance effects.
Main Results:
- Observation of anomalous magnetoresistance in AuFe wires at low temperatures.
- Hysteretic background observed at low magnetic fields.
- Kondo resistivity did not reach the unitarity limit, indicating uncompensated spins.
Conclusions:
- The anomalous magnetoresistance is potentially explained by geometric phase interference.
- Localized impurity spins in AuFe wires significantly influence electron wave functions.
- The findings contribute to the understanding of quantum interference effects in disordered conductors.