We report pressure dependence of the Fermi surfaces (FSs) in CeRu2Si2 below and above the metamagnetic transition field (Hm). Below Hm, the dHvA frequencies arising from hole FSs decrease by 20% on application of 6 kbar, while that from an electron FS increases by 10%. The pressure dependence of the frequencies above Hm is much larger than that below Hm. The results are discussed in comparison with those of ferromagnetic reference material CeRu2Ge2.
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