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Magnetic dephasing in mesoscopic spin glasses
Thibaut Capron1, Guillaume Forestier, Angela Perrat-Mabilon
1CNRS, Institut Néel, B.P. 166, 38042 Grenoble Cedex 09, France.
Physical Review Letters
|November 19, 2013
Summary
Universal conductance fluctuations in metallic spin glass Ag:Mn reveal that electron phase coherence time increases with lower temperature and stronger magnetic fields, indicating active decoherence mechanisms.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Metallic spin glasses exhibit complex magnetic ordering.
- Understanding electron transport is crucial for characterizing these materials.
Purpose of the Study:
- To investigate universal conductance fluctuations in Ag:Mn spin glass.
- To determine the phase coherence time of electrons in this system.
- To probe decoherence mechanisms at low temperatures.
Main Methods:
- Measurements of electrical conductance.
- Variable temperature and magnetic field studies.
- Analysis of universal conductance fluctuations.
Main Results:
- Phase coherence time was successfully extracted from conductance fluctuations.
- Phase coherence time shows a positive correlation with inverse temperature.
- Phase coherence time increases with applied magnetic field.
Conclusions:
- Decoherence mechanisms remain significant even deep within the spin glass phase.
- Electron phase coherence is sensitive to both thermal and magnetic field effects.
- This study provides insights into electron dynamics in disordered magnetic systems.
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