Robust Dirac-Cone Band Structure in the Molecular Kagome Compound (EDT-TTF-CONH2)(6) Re6Se8(CN)(6) - Université d'Angers Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2013

Robust Dirac-Cone Band Structure in the Molecular Kagome Compound (EDT-TTF-CONH2)(6) Re6Se8(CN)(6)

S. Carlsson
  • Fonction : Auteur
Leokadiya Zorina
  • Fonction : Auteur
D. Allan
  • Fonction : Auteur
J. Attfield
  • Fonction : Auteur
Enric Canadell
  • Fonction : Auteur
Patrick Batail
  • Fonction : Auteur
  • PersonId : 992004

Résumé

(EDT-TTF-CONH2)(6)[Re6Se8(CN)(6)] is a molecular solid with R3 space group symmetry and has the remarkable feature of exhibiting hybrid donor layers with a kagome topology which sustain metallic conductivity. We report a detailed study of the structural evolution of the system as a function of temperature and pressure. This rhombohedral phase is maintained on cooling down to 220 K or up to 0.7 GPa pressure, beyond which a symmetry-breaking transition to a triclinic PI phase drives a metal to insulator transition. Band structures calculated from the structural data lead to a clear description of the effects of temperature and pressure on the structural and electronic properties of this system. Linear energy dispersion is calculated at the zero-gap Fermi level where valence and conduction bands touch for the rhombohedral phase. (EDT-TTF-CONH2)(6)[Re6Se8(CN)(6)] thus exhibits a regular (right circular) Dirac-cone like that of graphene at the Fermi level, which has not been reported previously in a molecular solid. The Dirac-cone is robust over the stability region of the rhombohedral phase, and may result in exotic electronic transport and optical properties.

Domaines

Chimie

Dates et versions

hal-03344538 , version 1 (15-09-2021)

Identifiants

Citer

S. Carlsson, Leokadiya Zorina, D. Allan, J. Attfield, Enric Canadell, et al.. Robust Dirac-Cone Band Structure in the Molecular Kagome Compound (EDT-TTF-CONH2)(6) Re6Se8(CN)(6). Inorganic Chemistry, 2013, 52 (6), pp.3326-3333. ⟨10.1021/ic302790m⟩. ⟨hal-03344538⟩
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