Interpretation of the angular dependence of the de Haas-van Alphen effect in MgB_2

Details Interpretation of the angular dependence of the de Haas-van Alphen effect in MgB_2 Interpretation of the angular dependence of the de Haas-van Alphen effect in MgB_2

2004-12-14

arxiv.org/abs/cond-mat/0412359v1

Phys. Rev. B 71, 174505 (2005)

Physics

Condensed Matter

Superconductivity

4 pages with figures. Submitted to PRB

Scientific paper

10.1103/PhysRevB.71.174505

We present detailed results for the amplitude and field dependence of the de Haas-van Alphen (dHvA) signal arising from the electron-like $\pi$ sheet of Fermi surface in MgB_2. 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 MgB_2 are small on both the Sigma and Pi sheets.

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