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In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 Revisited

Mroweh, Nabil ; Mézière, Cécile ; Pop, Flavia ; Auban‐Senzier, Pascale ; Alemany, Pere ; Canadell, Enric ; Avarvari, Narcis

Advanced materials (Weinheim), 2020-09, Vol.32 (36), p.e2002811-n/a [Periódico revisado por pares]

Weinheim: Wiley Subscription Services, Inc

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  • Título:
    In Search of Chiral Molecular Superconductors: κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 Revisited
  • Autor: Mroweh, Nabil ; Mézière, Cécile ; Pop, Flavia ; Auban‐Senzier, Pascale ; Alemany, Pere ; Canadell, Enric ; Avarvari, Narcis
  • Assuntos: band structures ; Charge transfer ; Chirality ; Conductors ; Crystal structure ; Electrical resistivity ; Interlayers ; Materials science ; molecular conductors ; Pressure dependence ; Room temperature ; Single crystals ; Superconductivity ; Temperature dependence
  • É parte de: Advanced materials (Weinheim), 2020-09, Vol.32 (36), p.e2002811-n/a
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: The relationship between chirality and superconductivity is an intriguing question. The two enantiomeric crystalline radical cation salts κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 and κ‐[(R,R)‐DM‐BEDT‐TTF]2ClO4, showing κ‐type arrangement of the organic layers, are investigated in search for superconducting chiral molecular materials following a 1992 report indicating the occurrence of a superconducting transition in the former compound. While the initial interpretation is presently challenged through in‐depth temperature and pressure dependent single crystal resistivity measurements combined with band structure calculations, the two chiral conductors show metal like behavior with room temperature conductivities of 10–30 S cm−1 at ambient pressure and stabilization of the metallic state down to the lowest temperatures under moderate pressures. Moreover, their structural and theoretical investigations reveal an original feature, namely the existence of two different κ layers with 1D and 2D electronic dimensionality, respectively, as a consequence of an interlayer charge transfer. The resistivity drop observed for one sample below 1 K and insensitive to magnetic field, possibly results from mixing in‐plane and out‐of‐plane contributions to the measured resistance and suggests current induced charge order melting. This feature contradicts the occurrence of superconductivity in these chiral molecular conductors and leaves open the discovery of the first chiral molecular superconductors. The enantiopure mixed valence radical cations salts κ‐[(S,S)‐DM‐BEDT‐TTF]2ClO4 and κ‐[(R,R)‐DM‐BEDT‐TTF]2ClO4, prepared by electrocrystallization of the chiral donor DM‐BEDT‐TTF, show metallic conductivity but no superconducting transition, unlike the conclusions of an earlier report. Original structural and electronic features consisting in two different κ‐type layers having 1D and 2D electronic dimensionality are revealed by structural investigations and band structure calculations.
  • Editor: Weinheim: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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