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2009 ; 10
(2
): 024303
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Organic superconductors with an incommensurate anion structure
#MMPMID27877276
Kawamoto T
; Takimiya K
Sci Technol Adv Mater
2009[Apr]; 10
(2
): 024303
PMID27877276
show ga
Superconducting incommensurate organic composite crystals based on the
methylenedithio-tetraselenafulvalene (MDT-TSF) series donors, where the energy
band filling deviates from the usual 3/4-filled, are reviewed. The incommensurate
anion potential reconstructs the Fermi surface for both (MDT-TSF)(AuI(2))(0.436)
and (MDT-ST)(I(3))(0.417) neither by the fundamental anion periodicity q nor by 2
q , but by 3 q , where MDT-ST is
5H-2-(1,3-dithiol-2-ylidene)-1,3-diselena-4,6-dithiapentalene, and q is the
reciprocal lattice vector of the anion lattice. The selection rule of the
reconstructing vectors is associated with the magnitude of the incommensurate
potential. The considerably large interlayer transfer integral and
three-dimensional superconducting properties are due to the direct donor-donor
interactions coming from the characteristic corrugated conducting sheet
structure. The materials with high superconducting transition temperature, T(c),
have large ratios of the observed cyclotron masses to the bare ones, which
indicates that the strength of the many-body effect is the major determinant of
T(c). (MDT-TS)(AuI(2))(0.441) shows a metal-insulator transition at T(MI)=50 K,
where MDT-TS is 5H-2-(1,3-diselenol-2-ylidene)-1,3,4,6-tetrathiapentalene, and
the insulating phase is an antiferromagnet with a high Néel temperature (T(N)=50
K) and a high spin-flop field (B(sf)=6.9 T). There is a possibility that this
material is an incommensurate Mott insulator. Hydrostatic pressure suppresses the
insulating state and induces superconductivity at T(c)=3.2 K above 1.05 GPa,
where T(c) rises to the maximum, T(c)(max)=4.9 K at 1.27 GPa. This compound shows
a usual temperature-pressure phase diagram, in which the superconducting phase
borders on the antiferromagnetic insulating phase, despite the unusual band
filling.