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The de Haas-van Alphen effect across the metamagnetic transition in Sr₃Ru₂O₇

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arxiv cond-mat/0403390 v1 pith:P554DP66 submitted 2004-03-16 cond-mat.str-el

The de Haas-van Alphen effect across the metamagnetic transition in Sr₃Ru₂O₇

R. A. Borzi , S. A. Grigera , R. S. Perry , N. Kikugawa , K. Kitagawa , Y. Maeno , A. P. Mackenzie This is my paper
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keywords transitionalphendhvaeffecthaas-vanmetamagneticaboveacross
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We report a study of the de Haas-van Alphen (dHvA) effect on the itinerant metamagnet Sr$_3$Ru$_2$O$_7$. Extremely high sample purity allows the observation of dHvA oscillations both above and below the metamagnetic transition field of 7.9 T. The quasiparticle masses are fairly large away from the transition, and are enhanced by up to an extra factor of three as the transition is approached, but the Fermi surface topography change is quite small. The results are qualitatively consistent with a field-induced Stoner transition in which the mass enhancement is the result of critical fluctuations.

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