Physics – Condensed Matter – Superconductivity
Scientific paper
2004-05-06
Physical Review B 70, 144501 (2004)
Physics
Condensed Matter
Superconductivity
10 pages with figures. Submitted to Phys. Rev. B. PDF version with higher quality figures can be found at http://www.phy.bri
Scientific paper
10.1103/PhysRevB.70.144501
The de Haas-van Alphen (dHvA) signal arising from orbits on the $\pi$ Fermi surface sheet of the two-gap superconductor MgB$_2$ has been observed in the vortex state below $H_{c2}$. An extra attenuation of the dHvA signal, beyond those effects described in the conventional Lifshitz-Kosevich expression, is seen due to the opening of the superconducting gap. Our data show that the $\pi$ band gap is still present up to $H_{c2}$. The data are compared to current theories of dHvA oscillations in the superconducting state which allow us to extract estimates for the evolution of the $\pi$ band gap with magnetic field. Contrary to results for other materials, we find that the most recent theories dramatically underestimate the damping in MgB$_2$.
Carrington Alan
Fletcher J. D.
Karpinski Janusz
Kazakov Sergey M.
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