Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy

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dc.creatorHasan, M. Z.
dc.creatorChuang, Y. -D.
dc.creatorKuprin, A. P.
dc.creatorKong, Y.
dc.creatorQian, D.
dc.creatorLi, Y. W.
dc.creatorMesler, B. L.
dc.creatorHussain, Z.
dc.creatorFedorov, A. V.
dc.creatorKimmerling, R.
dc.creatorRotenberg, E.
dc.creatorRossnagel, K.
dc.creatorKoh, H.
dc.creatorRogado, N. S.
dc.creatorFoo, M. L.
dc.creatorCava, R. J.
dc.date2003-08-21
dc.date2003-11-20
dc.date.accessioned2026-07-07T02:53:03Z
dc.date.available2026-07-07T02:53:03Z
dc.descriptionWe present an angle-resolved photoemission study of Na0.7CoO2, the host cobaltate of the NaxCoO2.yH2O series. Our results show a large hexagonal-like hole-type Fermi surface, an extremely narrow strongly renormalized quasiparticle band and a small Fermi velocity. Along the Gamma to M high symmetry line, the quasiparticle band crosses the Fermi level from M toward Gamma consistent with a negative sign of effective single-particle hopping (t ): t is estimated to be about 8 meV which is on the order of exchange coupling J in this system. This suggests that t ~ J ~ 10 meV is an important energy scale in the system. Quasiparticles are well defined only in the T-linear resistivity regime. Small single particle hopping and unconventional quasiparticle dynamics may have implications for understanding the unusual behavior of this new class of compounds.
dc.descriptionRevised text, Added Figs, Submitted to PRL
dc.identifierhttps://arxiv.org/abs/cond-mat/0308438
dc.identifierhttp://arxiv.org/abs/cond-mat/0308438
dc.identifierPhys. Rev. Lett. 92, 246402 (2004)
dc.identifierdoi:10.1103/PhysRevLett.92.246402
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22065
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleFermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy
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