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Abstract:
We report a detailed investigation of quantum oscillations in Sr3Ru2O7,
observed inductively (the de Haas-van Alphen effect) and thermally (the
magnetocaloric effect). Working at fields from 3 to 18 T allowed us to
straddle the metamagnetic transition region and probe the low- and
high-field Fermi liquids. The observed frequencies are strongly field
dependent in the vicinity of the metamagnetic transition, and there is
evidence for magnetic breakdown. We also present the results of a
comprehensive rotation study. The most surprising result concerns the
field dependence of the measured quasiparticle masses. Contrary to
conclusions previously drawn by some of us as a result of a study
performed with a much poorer signal-to-noise ratio, none of the five
Fermi-surface branches for which we have good field-dependent data gives
evidence for a strong-field dependence of the mass. The implications of
these experimental findings are discussed.
