Magnetic-field-induced Fermi surface reconstruction in Na$_{0.5}$CoO$_2$

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dc.creatorBalicas, L.
dc.creatorAbdel-Jawad, M.
dc.creatorHussey, N. E.
dc.creatorChou, F. C.
dc.creatorLee, P. A.
dc.date2004-10-15
dc.date.accessioned2026-07-07T03:01:30Z
dc.date.available2026-07-07T03:01:30Z
dc.descriptionWe have performed electrical transport measurements at low temperatures and high magnetic fields in Na$_{0.5}$CoO$_2$ single crystals. Shubnikov de Haas oscillations were observed for two frequencies F_1 150 and F_2 40 T corresponding respectively to 1 and .25% of the area of the orthorhombic Brillouin zone. These small Fermi surface (FS) pockets indicate that most of the original FS vanishes at the charge ordering (CO) transition. Furthermore, in-plane magnetic fields strongly suppress the CO state. For fields rotating within the conducting planes we observe angular magnetoresistance oscillations (AMRO), whose periodicity changes from two- to six-fold at the transition, suggesting that a reconstructed hexagonal FS emerges at a field of about 40 T.
dc.description5 pages 4 figures. submitted
dc.identifierhttps://arxiv.org/abs/cond-mat/0410400
dc.identifierhttp://arxiv.org/abs/cond-mat/0410400
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25075
dc.subjectStrongly Correlated Electrons
dc.titleMagnetic-field-induced Fermi surface reconstruction in Na$_{0.5}$CoO$_2$
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