Emergence of Fermi pockets in an excitonic CDW melted novel superconductor

Abstract

A superconducting (SC) state (Tc ~ 4.2K) has very recently been observed upon successful doping of the CDW ordered triangular lattice TiSe${}_2$, with copper. Using high resolution photoemission spectroscopy we identify, for the first time, the momentum space locations of the doped electrons that form the Fermi sea of the parent superconductor. With doping, we find that the kinematic nesting volume increases whereas the coherence of the CDW order sharply drops. In the superconducting doping, we observe the emergence of a large density of states in the form of a narrow electron pocket near the \textit{L}-point of the Brillouin Zone with \textit{d}-like character. The \textit{k}-space electron distributions highlight the unconventional interplay of CDW to SC cross-over achieved through non-magnetic copper doping.

arXiv comment4+ pages, 5 figures; Accepted for publication in Phys. Rev. Lett. (2007)

References in corpus (8)

• Electronic Liquid Crystal Phases of a Doped Mott Insulator
• Superconductivity in Cu_xTiSe_2
• Fermi surface and quasiparticle dynamics of Na(x)CoO2 {x=0.7} investigated by Angle-Resolved Photoemission Spectroscopy
• Fabrication and superconductivity of NaxTaS2 crystals
• Quantum Melting of the Charge Density Wave State in 1T-TiSe2
• Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors (NaxCoO2)
• Complete d-Band Dispersion and the Mobile Fermion Scale in NaxCoO2
• Quasiparticle coherence and the nature of the metal-insulator phase transition in Na${}_x$CoO${}_2$

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