Damping of the de Haas-van Alphen oscillations in the superconducting state of MgB_2

Abstract

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${}_2$.

arXiv comment10 pages with figures. Submitted to Phys. Rev. B. PDF version with higher quality figures can be found at http://www.phy.bris.ac.uk/research/cond_matt/PdfPubs/mgb2RSdhva.pdf

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• Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2
• Hysteretic superconducting resistive transition in Ba0.07K0.93Fe2As2
• Quantum Oscillation Studies of the Fermi Surface of LaFePO
• Unconventional quantum vortex matter state hosts quantum oscillations in the underdoped high-temperature cuprate superconductors
• de Haas-van Alphen effect investigations of the electronic structure of pure and aluminum-doped MgB_2
• Large Broadening of the Superconducting Transition by Fluctuations in a 3D Metal at High Magnetic Fields: The MgB${}_2$ case
• Interpretation of the angular dependence of the de Haas-van Alphen effect in MgB_2