Damping of de Haas-van Alphen oscillations and vortex-lattice disorder in the peak-effect region of extreme type-II borocarbide superconductors

TitleDamping of de Haas-van Alphen oscillations and vortex-lattice disorder in the peak-effect region of extreme type-II borocarbide superconductors
Publication TypeJournal Article
Year of Publication2011
AuthorsManiv A, Maniv T, Zhuravlev V, Bergk B, Wosnitza J, Kohler A, Behr G, Canfield PC, Sonier JE
Journal TitlePhysical Review B
Volume83
Pages104505
Date Published03
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000288318100012
Keywordsfields, magnetic oscillations, single-crystals, state, yni2b2c
Abstract

The study of magnetic quantum oscillations in the superconducting state is of fundamental importance for understanding the nature of superconductivity under high magnetic fields. However, although studied for more than three decades, this phenomenon poses several basic questions that still defy satisfactory answers. A key controversial issue concerns the additional damping observed in the vortex state of many strong type-II superconductors. Here, we show results of mu SR, dHvA, and superconducting quantum interference device magnetization measurements on borocarbide superconductors, initially aimed at investigating the "phase-smearing" effect due to inhomogeneous field broadening. It is found, however, that a sharp drop observed in the dHvA amplitude just below H-c2 is correlated with enhanced disorder of the vortex lattice in the peak-effect region, where the phase-smearing effect is negligible. It is concluded that quasiparticle scattering by the pair potential is significantly enhanced due to vortex-lattice disorder, thus generating additional damping in the dHvA amplitude.

URL<Go to ISI>://000288318100012http://prb.aps.org/pdf/PRB/v83/i10/e104505
DOI10.1103/PhysRevB.83.104505
Alternate JournalPhys. Rev. B