Possible superconductivity in Au(dmit)2 Langmuir–Blodgett films

Miura, Yasühiro; Horikiri, Masashi; Tajima, S.; Wakaita, T.; Saito, Shinroku; Sugi, Michio

doi:10.1016/s0379-6779(02)00442-3

Cited by 16 publications

(17 citation statements)

References 5 publications

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“…Langmuir-Blodgett (LB) films of dialkylammonium-Au(dmit) 2 salts exhibited a high lateral conductivity of 40-100 S/cm at room temperature after electrochemical oxidation or I 2 doping; these films also showed metallic temperature dependence of the conductivity [19,20]. Furthermore, the ac magnetic susceptibility and resistance of these films suggested the existence of a superconducting phase below 4 K [21]. Further, Gupta and co-workers reported detailed monolayer behavior of alkylammonium-metal(dmit) 2 and electrical conduction of the resultant LB film [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Study of molecular arrangement of organized molecular films of charge–transfer complexes containing 1,3-dithiole-2-thione-4,5-dithiolate by in-plane and out-of-plane X-ray diffractions

Tatewaki¹,

Okada²,

Itagaki³

et al. 2010

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

“…Nakamura and co-workers conducted pioneering studies on structural and conductive properties of LB films containing dmit with various central metals [20,[32][33][34][35][36]. Miura, Sugi, and co-workers conducted extensive research on conductive LB films of charge-transfer complexes containing dimt [19,21,[37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Study of molecular arrangement of organized molecular films of charge–transfer complexes containing 1,3-dithiole-2-thione-4,5-dithiolate by in-plane and out-of-plane X-ray diffractions

Tatewaki¹,

Okada²,

Itagaki³

et al. 2010

Journal of Colloid and Interface Science

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“…7 The LB films of dialkylammonium-Au(dmit) 2 salts exhibited a high lateral conductivity of 40 -100 S/cm at room temperature after electrochemical oxidation or I 2 doping, and had metallic temperature dependence of the conductivity. 8,9 Furthermore, the ac magnetic susceptibility and resistance suggested the existence of a super conducting phase below 4 K. 10 Bryce and Petty reported electrical conductivity of LB films for charge-transfer complexes containing metal(dmit) 2 .…”

Section: Introductionmentioning

confidence: 99%

Epitaxial Growth of Conductive Charge-transfer Complex in the Organized Molecular Film on Fluorinated Copolymer as Template

Itagaki

Kusaka

Kubota³

et al. 2011

Trans. Mat. Res. Soc. Japan

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Epitaxial growth of organized molecular films of alkylammonium-Au bis(1, 3-dithiole-2-thione-4, 5-dithiolate) ((dmit) 2 ) charge-transfer complex on fluorinated copolymer as template estimated by in-plane X-ray diffraction (XRD). In the single crystal, didodecylammonium-Au(dmit) 2 molecules packed triclinic lattice. From the in-plane XRD measurement of multilayers on hydrogenated solids, alkyl-chains of this complex also formed triclinic system. The orthorhombic packing of this complex film formed on fluorinated crystalline polymer as substrate. This structural transition is induced by crystal structure of fluorinated copolymer as template. On the other hand, disordered molecular arrangement in these two-dimensional films formed on the amorphous fluorinated copolymer.

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“…2   Furthermore, the ac magnetic susceptibility and resistance of these films suggested the existence of a superconducting phase below 4 K. 3   Nakamura et al. conducted pioneering studies on structural and conductive properties of LB films containing M(dmit) 2  with various central metals. 4   Miura and Sugi conducted extensive research on conductiveLBfilmsofchargetransfercomplexes containingdimt.…”

mentioning

confidence: 99%

Study of Molecular Arrangement and Surface Morphology of Organized Molecular Films of Charge-Transfer Complexes Containing Metal(dmit)<sub>2</sub> Unit

Itagaki

Tatewaki

Fujimori

2010

Trans. Mat. Res. Soc. Japan

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2     The molecular arrangement and surface morphology of organized molecular films of alkylammoniumM bis(1, 3dithiole2thione4, 5dithiolate) ((dmit) 2 , M = Ni, Au, and Pd) chargetransfer complexes were investigated by using the surface pressure-area isotherm, inplane and outof plane Xray diffractions (XRD), and atomic force microscopy.  In the bulk state, several alkylammoniumM(dmit) 2 molecules could not form a highly ordered layer structure along the axis and a subcell structure of the alkyl chain in the plane; however, almost all molecules formed a layer structure in the film multilayers.  Monolayers of alkylammoniumM(dmit) 2  salts on the water surface were relatively condensed.  Outof planeandinplaneXRDmeasurementsrevealedthatoveralongperiod,systematicchangesoccurredinthe twodimensional lattice of alkylammoniumM(dmit) 2 salts and not in their bulk state.  These structural changes appear to be caused by enhancement of the van der Waals interaction among long hydrocarbons and the ππ interaction among M(dmit) 2  units arranged twodimensionally.  In addition, both the molecular arrangement and the morphology of the films showed dependence on the hydrocarbon length, number of alkyl chains, and kind of central metal.  In particular, the molecular arrangement of materials havingdidecylchainschangeddrasticallyandM(dmit) 2 unitswerehighlyorientedintheplane.  Keywords: alkylammoniummetal(dmit) 2 ; layer structure; twodimensional lattice; molecular arrangement; surfacemorphology   Alkylammoniummetal bis(1, 3dithiole2 thione4, 5dithiolate) (M(dmit) 2 ) complexes exhibit a variety of electrical properties ranging from dielectric to superconducting. 1     LangmuirBlodgett (LB) films of dialkyl ammoniumAu(dmit) 2  salts exhibited a high lateral conductivity of 40-100 S/cm at room temperature after electrochemical oxidation or I 2  doping; these films also showed metallic temperature dependence of the conductivity.2   Furthermore, the ac magnetic susceptibility and resistance of these films suggested the existence of a superconducting phase below 4 K.3   Nakamura et al. conducted pioneering studies on structural and conductive properties of LB films containing M(dmit) 2  with various central metals.4   Miura and Sugi conducted extensive research on conductiveLBfilmsofchargetransfercomplexes containingdimt.2,3,5  It has been elucidated that fieldeffect doping (FEdoping)isaneffective carrierdoping method...

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Possible superconductivity in Au(dmit)2 Langmuir–Blodgett films

Cited by 16 publications

References 5 publications

Study of molecular arrangement of organized molecular films of charge–transfer complexes containing 1,3-dithiole-2-thione-4,5-dithiolate by in-plane and out-of-plane X-ray diffractions

Study of molecular arrangement of organized molecular films of charge–transfer complexes containing 1,3-dithiole-2-thione-4,5-dithiolate by in-plane and out-of-plane X-ray diffractions

Epitaxial Growth of Conductive Charge-transfer Complex in the Organized Molecular Film on Fluorinated Copolymer as Template

Study of Molecular Arrangement and Surface Morphology of Organized Molecular Films of Charge-Transfer Complexes Containing Metal(dmit)<sub>2</sub> Unit

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