Magnetic Breakdown in Ferromagnetic Nickel

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Abstract
Using Mueller's interpolation scheme we had previously obtained good agreement with the dHvA measurements on the X pocket Fermi surface of Ni. We have extended these calculations to include the magnetic breakdown effects observed in the same experiment. Our calculations support the results of Ruvalds and Falicov who used k̄·p̄ perturbation theory and group theory to determine band degeneracies in symmetry planes normal to the applied magnetic field. Our model Hamiltonian yields the required accidental degeneracies between bands of opposite spin in these symmetry planes. Our band structure now also gives good agreement with the Fermi surface neck dHvA data.