Fermi Surface and Quasiparticle Dynamics of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi>Na</mml:mi></mml:mrow><mml:mn>0.7</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>CoO</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>Investigated by Angle-Resolved Photoemission Spectroscopy

M. Zahid Hasan, Yi‐De Chuang, Dong Qian, Y. W. Li, Yan Kong, A. Kuprin, А. В. Федоров, R. Kimmerling, Eli Rotenberg, Kai Roßnagel

Type: Article

Publication Date: 2004-06-18

Citations: 219

DOI: https://doi.org/10.1103/physrevlett.92.246402

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Abstract

We 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.

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