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Quantum oscillations near the metamagnetic transition in Sr3Ru2O7

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Citation

Mercure, J.-.-F., Rost, A. W., O'Farrell, E. C. T., Goh, S. K., Perry, R. S., Sutherland, M. L., et al. (2010). Quantum oscillations near the metamagnetic transition in Sr3Ru2O7. Physical Review B, 81(23): 235103, pp. 1-12. doi:10.1103/PhysRevB.81.235103.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-F284-9
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.