Mercure, J-F; Rost, AW; O'Farrell, ECT; Goh, SK; Perry, RS; Sutherland, ML; Grigera, SA; ... Mackenzie, AP; + view all Mercure, J-F; Rost, AW; O'Farrell, ECT; Goh, SK; Perry, RS; Sutherland, ML; Grigera, SA; Borzi, RA; Gegenwart, P; Gibbs, AS; Mackenzie, AP; - view fewer (2010) Quantum oscillations near the metamagnetic transition in Sr3Ru2O7. Physical Review B , 81 (23) , Article 235103. 10.1103/PhysRevB.81.235103.

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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.

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