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Abstract:
We report a study of the de Haas-van Alphen (dHvA) effect on the
itinerant metamagnet Sr3Ru2O7. Extremely high sample purity allows the
observation of dHvA oscillations both above and below the metamagnetic
transition field of 7.9 T. The quasiparticle masses are fairly large
away from the transition, and are enhanced by up to an extra factor of 3
as the transition is approached, but the Fermi surface topography change
is quite small. The results are qualitatively consistent with a
field-induced Stoner transition in which the mass enhancement is the
result of critical fluctuations.
