Interpretation of the angular dependence of the de Haas-van Alphen effect in MgB2
Abstract
We present detailed results for the amplitude and field dependence of the de Haas-van Alphen (dHvA) signal arising from the electron-like π sheet of Fermi surface in MgB2. Our data and analysis show that the dip in dHvA amplitude when the field is close to the basal plane is caused by a beat between two very similar dHvA frequencies and not a spin-zero effect as previously assumed. Our results imply that the Stoner enhancement factors in MgB2 are small on both the Sigma and Pi sheets.
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