Influence of pressure on de Haas-van Alphen frequencies in cobalt

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Abstract
The solid‐helium phase shift technique has been applied for measurement of pressure derivatives of de Haas‐van Alphen frequencies in ferromagnetic hcp cobalt. Our values for the β oscillations for the magnetic field H ∥ [0001] and the ε oscillations for H ∥ [101̄0] are (−1.9±0.2)×10−3 kbar−1 and (0.4±0.2)×10−3 kbar−1, respectively. These results, combined with the value for the α oscillations (H ∥ [0001]), (−1.4±0.3)×10−3 kbar−1, have been used to examine models of the band structure of cobalt. An important contribution to these shifts with pressure is the transfer of electrons from majority‐spin to minority‐spin bands corresponding to the decrease in magnetic moment per atom of cobalt with pressure.