Acoustic attenuation in a type-II superconductor at high magnetic fields

G. Bruun, V. Nikos Nicopoulos, N. Johnson

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We have calculated the longitudinal acoustic attenuation in a type-II superconductor in high magnetic fields within a mean-field BCS theory. We predict two additional features in the corresponding attenuation signal as compared to that of the Meissner state. Our analytical calculations predict the existence of oscillations in the attenuation as the external magnetic field is varied—this effect is associated with the Landau-level structure of the electron states and is analogous to the well-known de Haas-van Alphen oscillations in the mixed state. The attenuation directly probes the quasiparticle energies; the presence of gapless points in the quasiparticle spectrum, which is characteristic of type-II superconductors at high magnetic fields, shows up in the frequency (Formula presented) and temperature (Formula presented) dependence of the attenuation in the limit of low (Formula presented) and and low (Formula presented), respectively. At low (Formula presented) there is no analog to the discontinuity in the attenuation observed in the Meissner state when (Formula presented), where (Formula presented) is the quasiparticle energy gap. This result opens up the possiblity of experimentally determining the existence and nature of the gapless points in the quasiparticle spectrum of a type-II superconductor in high magnetic fields.

Original languageEnglish (US)
Pages (from-to)3051-3057
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number5
DOIs
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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