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(00)00639-1

Cited by 12 publications

(12 citation statements)

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“…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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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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“…of 73 ± 26 S/cm with a metallic temperature dependence in the range of 230-300 K after electrochemical oxidation [3,4]. Furthermore, we have also pointed out the possible superconductivity below 4 K from the ac magnetic susceptibility and resistance data [5][6][7].…”

Section: Introductionmentioning

confidence: 66%

“…The counter electrode was of a platinum rod. The details of the sample preparation are in our previous papers [3][4][5][6][7][8].…”

Section: Experimental 21 Sample Preparationmentioning

confidence: 99%

Correlation between the Conductance and Infrared Spectra of the Alkylammonium-Au(dmit)2 LB Films

Matsui¹,

Miura²,

Sugi³

2007

Trans. Mat. Res. Soc. Japan

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We have studied the correlation between the conductance and Fowier transfonn-infrared (FT-IR) spectra of the Langmuir-Blodgett (LB) film based on ditetradecyldimethylamrnonium-Au (dmith [2CwAu(dmith] salt. The 2CI4-Au(dmi(h salt was transferred onto a CaF 2 substrate and was electrochemicaUy oxidized using a constant current of 0.8 ~ in an aqueous solution of LiCl0 4 . The conductance and the FT-IR spectra were measured using a slit between the electrodes by taking out the samples from the electrolyte and dried by nitrogen gas every thirty minutes. We have already reported that the conductance gradually increases with time of the oxidation up to 150 min but it turns to decrease modestly later. Accompanied by the oxidation, a broad band appears in a wide range of 850-7000 cm"1 and the peak shifts from 2000 cm• 1 down to 1630 cm• 1 in the first 120 min and it turns to be constant later. The area change of the IR spectra, which is proportional to the oscillator strength, is in close agreement with the conductance behavior. These results strongly indicate that the broad absorption is of charge transfer (CT) band and the conducting properties can be controlled precisely by monitoring the CT band together with the CH 2 symmetric, CH 2 antisymmetric and C=S stretching bands located at around 2850 cm• 1 , 2920 cm" 1 and 1055 cm• 1 , respectively.

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“…Although for small number of samples, resistance drop on cooling is seen below 4 K, the majority of samples do not exhibit the resistance drop and the macroscopic zero resistance has not been observed for any samples [23].…”

Section: Resistance Behaviormentioning

confidence: 89%

“…Furthermore, the ac magnetic susceptibility measurement suggests that the 2C 14 -Au(dmit) 2 LB system has a superconducting phase below 4 K [8]. Macroscopic zero resistance has not been observed [9]. In this paper, we review the structure and electrical properties of the LB films and discuss the possibility of the existence of the superconducting phase.…”

Section: Introductionmentioning

confidence: 98%

Development of Highly Conductive Langmuir-Blodgett Films

Miura

Kitao

Matsui

et al. 2012

Trans. Mat. Res. Soc. Japan

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Studies on highly conductive LB films based on ditetradecyldimethylammonium-Au(dmit) 2 [2C 14 -Au(dmit) 2 ] salt have been reviewed. The room temperature conductivity of the 2C 14 -Au(dmit) 2 LB film is as high as 40 S/cm after electro-oxidation. The resistance vs. temperature plot depends on the gap distance for the measurement. A weak metallic behavior is seen from room temperature down to 210-250 K, when the gap distance is 500 µm, while it extends down to 56-106 K, when the gap distance is 5 µm, indicating that the disorders in the film are important limiting factors for the macroscopic resistance. The data of the complex magnetic susceptibility (χ' + iχ") suggest the existence of the Meissner state below 3.9 K. Although some samples show resistance drop on cooling below 4 K, the typical resistance behaviors are of activation type at the lower temperature. We consider that disorders such as grain boundaries and/or defects are important limiting factors that should be solved to improve the electrical conduction toward the realization of global superconductivity.

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Superconductivity in Au(dmit)2 Langmuir-Blodgett films

Cited by 12 publications

References 0 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

Correlation between the Conductance and Infrared Spectra of the Alkylammonium-Au(dmit)2 LB Films

Development of Highly Conductive Langmuir-Blodgett Films

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