Remnant fermi surface in the presence of an underlying instability in layered 1T-TaS2
We report high resolution angle-scanned photoemission and Fermi surface (FS) mapping experiments on the layered transition-metal dichalcogenide 1T-TaS2 in the quasicommensurate (metallic) and the commensurate (insulating) charge-density-wave (CDW) phase. Instead of a nesting induced partially removed FS in the CDW phase we find a pseudogap over large portions of the FS. This remnant FS exhibits the symmetry of the one-particle normal state FS. Possibly, this Mott localization induced transition represents the underlying instability responsible fur the pseudogapped FS.
Keywords: Charge-Density Waves ; Scanning-Tunneling-Microscopy ; Transition-Metal Dichalcogenides ; Electronic-Structure ; Phase-Transitions ; Band Structures ; Doped 1T-Tas2 ; Photoemission ; Temperature ; Localization
Record created on 2010-04-07, modified on 2016-08-08