Electronic localization in an extreme 1-D conductor: the organic salt (TTDM-TTF)(2) [Au(mnt)(2)]

resumo

This article reports the investigation of a new low-dimensional organic salt, (TTDM-TTF)(2) [Au(mnt)(2)], by single crystal X-ray diffraction, static magnetic susceptibility, EPR, thermopower, electrical resistivity measurements under pressure up to 25 kbar and band,structure calculations. The crystal structure consists in a dimerized head to tail stacking of TTDM-TTF molecules separated by layers of orthogonal Au(mnt)(2) anions. The absence of overlap between neighboring chains coming from this particular crystal structure leads to an extreme one-dimensionality (1-D) for which the carriers of the half-filled conduction band become strongly localized in a Mott-Hubbard insulating state. This material is the first 1-D conductor in which the Mott-Hubbard insulating character cannot be suppressed under pressure.

palavras-chave

CHARGE LOCALIZATION; THERMOPOWER; SUPERCONDUCTORS; (TM)(2)X; ASF6; PF6

categoria

Physics

autores

Lopes, EB; Alves, H; Ribera, E; Mas-Torrent, M; Auban-Senzier, P; Canadell, E; Henriques, RT; Almeida, M; Molins, E; Veciana, J; Rovira, C; Jerome, D

nossos autores

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