Superconducting energy gap in a MgB2 film observed by infrared reflectance

A. Pimenov, A. Loidl, and S. I. Krasnosvobodtsev
Phys. Rev. B 65, 172502 – Published 9 April 2002
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Abstract

Far-infrared reflectance of a MgB2 film has been measured by Fourier-transform spectroscopy for frequencies 10cm1<ν<4000cm1 above and below the superconducting transition. The data provide clear experimental evidence for the onset of a superconducting gap at 24cm1 at T=5K. On increasing the temperature the gap energy increases, contrary to what is expected in isotropic BCS superconductors. The small zero-temperature gap value and its unconventional increases on increasing temperature can only be explained by a highly anisotropic or multiple gap function.

  • Received 9 January 2002

DOI:https://doi.org/10.1103/PhysRevB.65.172502

©2002 American Physical Society

Authors & Affiliations

A. Pimenov1, A. Loidl1, and S. I. Krasnosvobodtsev2

  • 1Experimentalphysik V, EKM, Universität Augsburg, 86135 Augsburg, Germany
  • 2P. N. Lebedev Physics Institute, Russian Academy of Sciences, 117924 Moscow, Russia

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Vol. 65, Iss. 17 — 1 May 2002

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