Quantum oscillations near the metamagnetic transition in Sr3Ru2O7

Abstract

We report 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 T 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.

12 pages, 12 figures, submitted to PRB

References in corpus (4)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• Fermi surface and van Hove singularities in the itinerant metamagnet Sr3Ru2O7
• Quasiparticle Interference in the Unconventional Metamagnetic Compound Sr${}_3$Ru${}_2$O${}_7$

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