Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-08-21
Phys. Rev. Lett. 92, 246402 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
Revised text, Added Figs, Submitted to PRL
Scientific paper
10.1103/PhysRevLett.92.246402
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.
Cava Robert. J.
Chuang Y.-D.
Fedorov Alexi V.
Foo Maw Lin
Hasan Zahid Md.
No associations
LandOfFree
Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-541639