Absence of persistent magnetic oscillations in type-II superconductors

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.4239· OSTI ID:288797

Norman, M R ^[1]; MacDonald, A H ^[2]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)

We report on a numerical study intended to examine the possibility that magnetic oscillations persist in type-II superconductors beyond the point where the pairing self-energy exceeds the normal state Landau level separation. Our work is based on the self-consistent numerical solution for model superconductors of the Bogoliubov{endash}de Gennes equations for the vortex lattice state. In the regime where the pairing self-energy is smaller than the cyclotron energy, magnetic oscillations resulting from Landau level quantization are suppressed by the broadening of quasiparticle Landau levels due to the nonuniform order parameter of the vortex lattice state and by splittings of the quasiparticle bands. Plausible arguments that the latter effect can lead to a sign change of the fundamental harmonic of the magnetic oscillations when the pairing self-energy is comparable to the cyclotron energy are shown to be flawed. Our calculations indicate that magnetic oscillations are strongly suppressed once the pairing self-energy exceeds the Landau level separation. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 288797
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOGOLYUBOV METHOD
FLUX-LINE LATTICES
LANDAU LEVELS
MAGNETIC PROPERTIES
NUMERICAL SOLUTION
OSCILLATIONS
PAIRING ENERGY
QUASI PARTICLES
TYPE-II SUPERCONDUCTORS