Low-Lying Quasiparticle States and Hidden Collective Charge Instabilities in Parent Cobaltate Superconductors
D. Qian, D. Hsieh, L. Wray, Y.-D. Chuang, A. Fedorov, D. Wu, J. L. Luo, N. L. Wang, L. Viciu, R. J. Cava, M. Z. Hasan
DOI 10.1103/PhysRevLett.96.216405 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report a state-of-the-art photoemission (angle-resolved photoemission spectroscopy) 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 Å) and only weakly anisotropic over the Fermi surface at all dopings, setting the size of the pair wave function to be on the order of 10–20 nm. In the low-doping regime, the exchange interlayer 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 most other oxide superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Extraordinary Doping Effects on Quasiparticle Scattering and Bandwidth in Iron-Based Superconductors
similarity 0.91Z. R. Ye et al.
Source status unknown — claims are unverified
Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors (NaxCoO2)
similarity 0.91D. Qian et al. · 2006 · arXiv:cond-mat/0605547
Source status unknown — claims are unverified
Origin of strong correlations and superconductivity in NaxCoO2
similarity 0.90Giniyat Khaliullin & Jiří Chaloupka
Source status unknown — claims are unverified
Orbital-selective superconductivity, gap anisotropy, and spin resonance excitations in a multiorbital t-J1-J2 model for iron pnictides
similarity 0.90Rong Yu et al.
Source status unknown — claims are unverified
Angle-Resolved Photoemission Study of the Cobalt Oxide Superconductor NaxCoO2·yH2O: Observation of the Fermi Surface
similarity 0.89T. Shimojima et al.
Source status unknown — claims are unverified
Superconductivity and magnetic fluctuations in electron-doped cobaltate superconductors
similarity 0.88Ying Liang & Bin Liu · 2012 · arXiv:1212.5367
Source status unknown — claims are unverified