Physics – Condensed Matter – Superconductivity
Scientific paper
2006-05-23
Phys. Rev. Lett. 96, 216405 (2006)
Physics
Condensed Matter
Superconductivity
Accepted for publication in Phys. Rev. Lett. (2006)
Scientific paper
10.1103/PhysRevLett.96.216405
We report a state-of-the-art photoemission (ARPES) study of high quality single crystals of the NaxCoO2 series focusing on the fine details of the low-energy states. The Fermi velocity is found to be small (< 0.5 eV.A) and only weakly anisotropic over the Fermi surface at all dopings setting the size of the pair wavefunction to be on the order of 10-20 nanometers. In the low doping regime the exchange inter-layer splitting vanishes and two dimensional collective instabilities such as 120-type fluctuations become kinematically allowed. Our results suggest that the unusually small Fermi velocity and the unique symmetry of kinematic instabilities distinguish cobaltates from other unconventional oxide superconductors such as the cuprates or the ruthenates.
Cava Robert. J.
Fedorov Arkady
Hasan Zahid Md.
Hsieh David
Luo Jian-Lin
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