Bulletin of the American Physical Society
2006 APS March Meeting
Monday–Friday, March 13–17, 2006; Baltimore, MD
Session N3: Insulating Cobaltates: Mottness on a Triangular Lattice
8:00 AM–11:00 AM,
Wednesday, March 15, 2006
Baltimore Convention Center Room: Ballroom I
Sponsoring Unit: DCMP
Chair: Philip Phillips, University of Illinois
Abstract ID: BAPS.2006.MAR.N3.2
Abstract: N3.00002 : Quasiparticles, Fermi surface topology and Phase transitions in Na$_x$CoO$_2$*
8:36 AM–9:12 AM
Preview Abstract Abstract
M. Zahid Hasan
(Dept. of Physics, Princeton University, Princeton, NJ)
Recently discovered triangular cobaltate class is a novel realization of doped Mott insulators on a triangular spin- lattice. This system exhibits superconductivity, spin-density- waves, charge-order, metal-insulator phase transitions and colossal thermopower as well as Mott and Band insulation. We employ state-of-the-art ARPES to uncover the nature of electron motion in the cobaltates over the phase diagram. Quasiparticle dynamics (Fermi velocity, bandwidth, FS topology, correlation parameters, quasiparticle coherence) we extract from the data provides valueable insights into the novel phases of matter realized on this first realization of a triangular lattice Mott system. Low-T metal-insulator (order-disorder) phase transition will be discussed in this presentation.
*Work in collaboration with D.Qian, R.J. Cava, Z. Hussain and A. Fedorov. This work is supported by U.S. DOE, NSF and Princeton Center for Complex Materials and partially carried out at the Advanced Light Source.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.MAR.N3.2
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