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V. A. Ivanov E. A. Ugolkova M. E. Zhuravlev 《Journal of Experimental and Theoretical Physics》1998,86(2):395-404
We have analyzed the electronic structure and superconducting properties of layered crystals based on BEDT-TTF salts (hereafter
denoted as ET), in which intramolecular interaction among electrons is important. For the case of realistic κ-packing of ET-molecules in a plane of ET2 dimers we have calculated the electron density of states. Using the calculated electronic structure, we have analyzed the
symmetry of the anisotropic superconducting pairing. The critical value of the effective attraction between electrons for
formation of a bound pair in an empty lattice has been estimated. The relation between the nodes of the d-type order parameter on the anisotropic Fermi surface and superconducting properties of the condensate is discussed in the
Bardeen-Cooper-Schrieffer (BCS) model. The results are in agreement with the known band parameters of the normal phase and
measurements of the magnetic field penetration depth, heat capacity as a function of temperature in the low-temperature range,
and NMR in κ-ET2X superconducting salts.
Zh. éksp. Teor. Fiz. 113, 715–733 (February 1998) 相似文献
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Nam MS Ardavan A Symington JA Singleton J Harrison N Mielke CH Schlueter JA Winter RW Gard GL 《Physical review letters》2001,87(11):117001
We show that Shubnikov-de Haas oscillations in the interlayer resistivity of the organic superconductor beta(")-(BEDT-TTF)2SF5CH2CF2SO3 become very pronounced in magnetic fields approximately 60 T. The conductivity minima exhibit thermally activated behavior that can be explained simply by the presence of a Landau gap, with the quasi-one-dimensional Fermi surface sheets contributing negligibly to the conductivity. This observation, together with complete suppression of chemical potential oscillations, is consistent with an incommensurate nesting instability of the quasi-one-dimensional sheets. 相似文献
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13C-MASS spectra of pure BEDT-TTF and of the organic metals αt-(BEDT-TTF)2I3 and (BEDT-TTF)2Cu(NCS)2 were recorded atν L = 68 MHz. Isotropic shifts and the principal components of the shift tensors were determined, respectively, from the center and spinning side bands. For pure BEDT-TTF which is a diamagnetic insolator, the measured shifts arechemical shifts while for the organic metals they are the sum of chemical and Knight shifts. In each of the compounds the shifts are assigned ingroups to theinner, middle andouter carbons of the BEDT-TTF molecule. For the organic metals the separation of the experimental shifts into chemical and Knight shifts is discussed. From the anisotropic part of the Knight shift tensors the π-spin densities at the carbon and sulphur positions of the BEDT-TTF molecule are inferred. The result is that the π-spin density of the unpaired hole is concentrated on the center part of the BEDT-TTF molecule, i.e., on the inner and middle carbons, and on the inner sulphurs. It is argued that the current density is concentrated on this part of the BEDT-TTF molecule as well. 相似文献