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Concerning the first-order phase transition in the low-dimensional organic superconductor . Crystal and electronic band structures below the phase transition (1998)

Khasanov, S.S. ; Narymbetov, B.Z. ; Zorina, L.V. ; [et al.]

Springer

The European physical journal 1 (1998), S. 419-428

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ISSN: 1434-6036

Keywords: PACS. 61.66.Hq Organic compounds - 74.70.Kn Organic superconductors

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: The effect of the first-order phase transition occurring around 220 K on the crystal and electronic structure of the molecular superconductor (BEDO-TTF) has been studied. The crystal structure at 170 K has been determined and it is found that the main structural change resulting from the phase transition is connected with a rotation of the anions. This rotation leads to changes in the S S and S O intermolecular contacts within the BEDO-TTF donor layers. How these structural changes affect the electronic structure of the salt is studied by comparing the transfer integrals for the different donor donor intermolecular interactions calculated for the room temperature and 170 K crystal structures. It is shown that Fermi surfaces for the 170 K and room temperature structures are very similar, do not exhibit nesting properties, and can be described as resulting from the hybridization of superposing ellipses.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100510050205

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A new stable organic metal: -(BETS) C(CN) . The first -type radical cation salt with a planar-triangular discrete organic anion (1998)

Narymbetov, B.Z. ; Kushch, N.D. ; Zorina, L.V. ; [et al.]

Springer

The European physical journal 5 (1998), S. 179-185

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ISSN: 1434-6036

Keywords: PACS. 61.66.Hq. Organic compounds[:AND:]71.18+y. Fermi surface: calculations and measurements

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract: The -(BETS)2C(CN)3 radical cation salt was prepared by electrocrystallization, and its crystal structure was determined by single crystal X-ray diffraction. The electronic structure of -(BETS)2C(CN)3 was studied by means of the extended Hückel tight binding method. The electrical conductivity of this salt as a function of temperature shows a metallic behaviour down to 1.3 K. Shubnikov-de Haas oscillations reveal both the classical and magnetic breakdown orbits on the Fermi surface typical of the -type organic conductors. In addition, a low frequency oscillation (250 T) which is not predicted by the band structure calculations has been found in the oscillation spectrum.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s100510050432

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