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

G. M. Bruun, V. Nikos Nicopoulos, Neil F Johnson

Research output: Contribution to journalArticle

3 Citations (Scopus)

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 ω and temperature T dependence of the attenuation in the limit of low ω and and low T, respectively. At low T there is no analog to the discontinuity in the attenuation observed in the Meissner state when ℏω=2Δ, where A 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
StatePublished - Feb 1 1998
Externally publishedYes

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acoustic attenuation
Superconducting materials
attenuation
Acoustics
Magnetic fields
magnetic fields
Mean field theory
oscillations
BCS theory
Electron energy levels
electron states
Energy gap
discontinuity
analogs
probes
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Acoustic attenuation in a type-II superconductor at high magnetic fields. / Bruun, G. M.; Nikos Nicopoulos, V.; Johnson, Neil F.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 57, No. 5, 01.02.1998, p. 3051-3057.

Research output: Contribution to journalArticle

Bruun, GM, Nikos Nicopoulos, V & Johnson, NF 1998, 'Acoustic attenuation in a type-II superconductor at high magnetic fields', Physical Review B - Condensed Matter and Materials Physics, vol. 57, no. 5, pp. 3051-3057.
Bruun, G. M. ; Nikos Nicopoulos, V. ; Johnson, Neil F. / Acoustic attenuation in a type-II superconductor at high magnetic fields. In: Physical Review B - Condensed Matter and Materials Physics. 1998 ; Vol. 57, No. 5. pp. 3051-3057.
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