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Evidence for weak itinerant long-range magnetic correlations in UGe2
A Yaouanc1, P Dalmas de Réotier, P C M Gubbens
1Commissariat à l'Energie Atomique, Département de Recherche Fondamentale sur la Matière Condensée, F-38054 Grenoble Cedex 9, France.
Physical Review Letters
|October 9, 2002
Summary
Positive muon spin relaxation measurements on the ferromagnet uranium digermanide (UGe2) reveal localized 5f-electron density and itinerant quasistatic magnetic correlations. These correlations, involving small magnetic moments, follow conventional dipolar Heisenberg model dynamics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Uranium digermanide (UGe2) is a well-known ferromagnet.
- Its bulk magnetic properties are attributed to localized 5f-electron density.
Purpose of the Study:
- To investigate the magnetic properties of UGe2 beyond its known bulk characteristics.
- To identify and characterize any additional magnetic correlations present in the material.
Main Methods:
- Utilized positive muon spin relaxation (μSR) measurements.
- Analyzed the dynamics and nature of magnetic correlations observed.
Main Results:
- Confirmed the presence of localized 5f-electron density responsible for bulk magnetism.
- Discovered evidence of itinerant quasistatic magnetic correlations.
- Determined that these correlations involve small magnetic moments.
- Observed that the critical dynamics align with the conventional dipolar Heisenberg model.
Conclusions:
- UGe2 exhibits both localized and itinerant magnetic characteristics.
- The itinerant magnetic correlations are quasistatic and involve small moments.
- The dipolar Heisenberg model effectively describes the critical dynamics of these correlations.