Faculté des sciences

Remnant Fermi Surface in the Presence of an Underlying Instability in Layered 1T–TaS2

Pillo, Th. ; Hayoz, J. ; Berger, H. ; Grioni, M. ; Schlapbach, Louis ; Aebi, Philipp

In: Physical Review Letters, 1999, vol. 83, no. 17, p. 3494-3497

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... Plus

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    Summary
    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 for the pseudogapped FS.