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de Haas-van Alphen effect across the metamagnetic transition in Sr3Ru2O7
R A Borzi1, S A Grigera, R S Perry
1School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom.
Physical Review Letters
|July 13, 2004
Summary
High-purity strontium ruthenium oxide (Sr3Ru2O7) reveals quantum oscillations near its metamagnetic transition. Quasiparticle masses significantly increase approaching the transition, suggesting critical fluctuations influence electronic behavior.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- The itinerant metamagnet strontium ruthenium oxide (Sr3Ru2O7) exhibits complex electronic properties.
- Understanding its behavior near the metamagnetic transition is crucial for exploring novel quantum phenomena.
Purpose of the Study:
- To investigate the de Haas-van Alphen (dHvA) effect in Sr3Ru2O7.
- To probe the electronic structure and quasiparticle properties around the metamagnetic transition field.
Main Methods:
- Experimental study of the de Haas-van Alphen (dHvA) effect.
- Utilized extremely high sample purity to observe quantum oscillations.
- Measurements conducted above and below the metamagnetic transition field of 7.9 T.
Main Results:
- Observed dHvA oscillations both above and below the 7.9 T metamagnetic transition.
- Quasiparticle masses were found to be large and enhanced by up to a factor of 3 near the transition.
- The Fermi surface topography showed only minor changes despite significant mass enhancement.
Conclusions:
- The observed mass enhancement is consistent with a field-induced Stoner transition.
- Critical fluctuations near the transition are likely responsible for the enhanced quasiparticle masses.
- Suggests a complex interplay between electronic correlations and magnetic fields in Sr3Ru2O7.