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20 April 2024

» pubmed » pmid15245114

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Fermi surface and quasiparticle dynamics of Na0.7CoO2 investigated by angle-resolved photoemission spectroscopy
M Z Hasan ; Y-D Chuang ; D Qian ; Y W Li ; Y Kong ; A Kuprin ; A V Fedorov ; R Kimmerling ; E Rotenberg ; K Rossnagel ; Z Hussain ; H Koh ; N S Rogado ; M L Foo ; R J Cava ;
Date:	18 Jun 2004
Journal:	Phys Rev Lett, 92 (24), 246402
Abstract:	We present the first angle-resolved photoemission study of Na0.7CoO2, the host material of the superconducting NaxCoO2.nH(2)O series. Our results show a hole-type Fermi surface, a strongly renormalized quasiparticle band, a small Fermi velocity, and a large Hubbard U. The quasiparticle band crosses the Fermi level from M toward Gamma suggesting a negative sign of effective single-particle hopping t(eff) (about 10 meV) which is on the order of magnetic exchange coupling J in this system. Quasiparticles are well defined only in the T-linear resistivity (non-Fermi-liquid) regime. Unusually small single-particle hopping and unconventional quasiparticle dynamics may have implications for understanding the phase of matter realized in this new class of a strongly interacting quantum system.
Source:	PubMed, pmid15245114
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