Bis(ethylenedioxy)tetrathiafulvalene: the first oxygen substituted tetrathiafulvalene

Suzuki, Toshiyasu; Yamochi, Hideki; Srdanov, G.; Hinkelmann, Klaus; Wudl, F.

doi:10.1021/ja00190a079

Cited by 163 publications

(54 citation statements)

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“…Most organic superconductors are radical salts of the organic donor BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene). BEDO-TTF (bis(ethylenedioxy)tetrathiafulvalene) [3], an isostructural analogue of BEDT-TTF, led to a number of metallic salts as well [3][4][5][6][7][8][9], but only two salts, (BEDO-TTF)3Cuz(NCS)3 [5] and (BEDO-TTF)zReO4. (H20) [8,9], have so far been found to be superconductors.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the Fermi surface and phase transitions of (BEDO-TTF)2 ReO4�(H2O) by physical property measurements and electronic band structure calculations

Kahlich

Schweitzer

Rovira

et al. 1994

Z. Physik B - Condensed Matter

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Abstract. The electronic properties of the organic superconductor (BEDO-TTF)2 ReO4.(H20 ) were investigated by temperature dependent resistivity, ESR, Hall effect and magnetoresistance measurements. Shubnikov-de Haas (SdH) oscillations were observed in magnetic fields up to 24 T in the temperature range 0.5 K to 4.2 K. The electronic band structure of (BEDO-TTF)2 ReO 4. (H20) was calculated by employing the extended Hiickel tight binding method on the basis of its room temperature crystal structure. The two observed SdH frequencies of 75 T and 37 T correspond very well with two cross-sectional areas of the hole and electron Fermi surface pockets obtained from the tight binding calculation. From the temperature dependence of the SdH oscillation amplitudes, the cyclotron effective mass (me) belonging to the larger and smaller pockets were found to be 0.9 m o and mc = 1.15 m 0 respectively. Measurements of the angular dependence of the SdH frequencies show no deviation from that expected for a cylindrical Fermi surface. In terms of our tight binding calculations and experimental measurements, probable causes for the 213K and 35 K phase transitions are discussed. The calculations show that (BEDO-TTF)2 ReO 4.(H20 ) is a two dimensional semimetal but possesses a hidden nesting. The latter is likely to cause an SDW instability leading to the 35 K transition. The resistivity drop associated with the 213 K transition is likely to be induced by an abrupt increase in the relaxation time. The excellent agreement between the calculated and experimentally observed Fermi surface implies that, with decreasing temperature be-

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Section: Introductionmentioning

confidence: 99%

Characterisation of the Fermi surface and phase transitions of (BEDO-TTF)2 ReO4�(H2O) by physical property measurements and electronic band structure calculations

Kahlich

Schweitzer

Rovira

et al. 1994

Z. Physik B - Condensed Matter

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“…(BEDO-TTF)2ReO4. (H20) is the second crystal system in the large family of the radical salts of the electron donor BEDO-TTF (bisethylenedithiolotetrathiafulvalene [2]) in which superconductivity in the bulk was observed. Before only in single crystals of (BEDO-TFF)a .Cu2(NCS)3 [3] superconductivity (below 1 K) was found.…”

Section: Introductionmentioning

confidence: 99%

Pressure dependence of the resistivity of (BEDO-TTF)2ReO4·(H2O)

Kahlich¹,

Schweitzer²,

Auban‐Senzier³

et al. 1992

Solid State Communications

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The temperature dependence of the resistivity under pressure (up to 6kbar) of the organic metal (BEDO-TTF)2ReO4(H20) was investigated. The increase of the resistivity below 35K, which is observed at ambient pressure, is already totally suppressed at I kbsr. In addition at this pressure the superconducting transition sharpens drastically and the onset temperature of 2.3 K is nearly the same as at ambient pressure.

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“…Numerical information on the refinement is given in Table 2. (2) BO2.413 (Wudl, Yamochi, Suzuki, lsotalo, Fire, Kasmai, Liou, Srdanov, Coppens, Maly & FrostJensen, 1990) BO [ = 3,4;3'4'-bis(ethylenedioxy)-2,2',5,5'-tetrathiafulvalene or BEDO-TTF] was first synthesized by Wudl and co-workers (Suzuki, Yamochi, Srdanov, Hinkelmann & Wudl, 1989). Its triiodide salt has a composite structure with different periodicities of the BO and triiodide components along the b axis.…”

Section: Examplesmentioning

confidence: 99%