de Haas-van Alphen Effect of Strongly Correlated f-Electron Systems under Pressure

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We have studied the de Haas-van Alphen (dHvA) effect under pressure for some typical compounds of strongly correlated Ce compounds CeSb, CeB₆, CeRu₂Si₂, CeRu₂Ge₂ and CeCo₂. The pressure dependence of the dHvA frequencies is much larger than that expected from compressibility or that of normal metals. The pressure dependence of the effective masses have been measured in CeSb and CeB₆, and it is difficult to explain that in terms of the increase of mixing with pressure.