Quantum oscillations near the metamagnetic transition inSr3Ru2O7

Abstract

We report detailed investigation of quantum oscillations in Sr 3 Ru 2 O 7 , observed inductively (the de Haasvan 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.

Multiple Metamagnetic Quantum Criticality inSr3Ru2O7Tokiwa1, Mchalwat2, Perry3 et al. 2016Phys. Rev. Lett.Self Cite234231View full textAdd to dashboardCite

“…Metamagnetism in Sr 3 Ru 2 O 7 is supposed to arise from van Hove singularities near the Fermi level [26]. A change of the de Haas-van Alphen frequencies near 8 T has been ascribed to magnetic breakdown [27]. This could explain the increase of the effective dimensionality of critical fluctuations, deduced from our scaling analysis.…”

Quantum critical metamagnetism of Sr3Ru2O

“…The real part of the ac susceptibility, χ , exhibits a pronounced peak, numbered 1 in Fig. 2, across the MMT at a field H M ≈ 5.3 T, and two minor peaks, numbered 2 and 3, at higher fields, H ≈ 6.06 T and H ≈ 6.6 T. These features are believed to reflect sharp peaks in the density of states, such as would arise for example from a van Hove singularity, 9,18 but a detailed connection with the rather complex electronic structure of Sr 3 Ru 2 O 7 28 has not yet been possible. Peak 2 at H ≈ 6.06 T evolves into a double feature with decreasing temperature, reminiscent of the static differential susceptibility reported for this peak in Ref.…”

Quasiparticle interference in the unconventional metamagnetic compoundSr3Ru2O7

“…It has been illustrated in Ref. 68 that the Fermi surface of Sr 3 Ru 2 O 7 can be schematically understood from that of Sr 2 RuO 4 . In Sr 2 RuO 4 , the hybridizations of the t 2g bands result in three eigenbands: ␣ and ␤ bands with mostly quasi-1D d yz and d xz characters, and ␥ band with dominant d xy character.…”