Quantum oscillations near the metamagnetic transition in Sr3Ru2O7

J. -F. Mercure, A. W. Rost, E. C. T. O'Farrell, S. K. Goh, Robin Perry, M. L. Sutherland, S. A. Grigera, R. A. Borzi, P. Gegenwart, A. S. Gibbs, A. P. Mackenzie

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Abstract / Description of output

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.

Original languageEnglish
Article number235103
Pages (from-to)-
Number of pages12
JournalPhysical review B
Issue number23
Publication statusPublished - 2 Jun 2010


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