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  • 1
    Electronic Resource
    Electronic Resource
    The possibility of superconductivity in quasi-one-dimensional polymers with a carbon skeleton (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 7621-7624 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The possible ordered phases of quasi-one-dimensional polymers with a carbon skeleton are studied by means of a temperature dependent Green's function approach. The transition temperature obeys a power law for such polymers. This unusual property is due to the presence of a divergent density of states at the Fermi level. It follows that they may represent a new class of organic superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464702
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  • 2
    Electronic Resource
    Electronic Resource
    Diffuse scattering from dodecagonal quasicrystals (2000)
    Springer
    The European physical journal 13 (2000), S. 21-30 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 61.44.Br Quasicrystals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: General formulae for thermal diffuse scattering from quasicrystals are applied to the case of dodecagonal quasicrystals from corresponding elasticity theory. Contours of constant diffuse scattering intensity are illustrated. Unlike ordinary crystals, shapes of isointensity contours are much more complicated and vary even among the collinear Bragg spots. Diffuse scattering patterns in the plane perpendicular to a given zone axis are associated with corresponding specific elastic constants. Information about elastic constants can be extracted from quantitative analysis of diffuse scattering patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050005
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  • 3
    Electronic Resource
    Electronic Resource
    Symmetric and symmetry-broken Hartree-Fock solutions of one-dimensional models (1989)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 36 (1989), S. 659-667 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pariser-Parr-Pople Hartree-Fock crystal orbital calculations (both restricted and unrestricted versions) are performed for one-dimensional models of π-electron polymers. The π-electron band structures corresponding to symmetric and nonsymmetric solutions have been calculated. To investigate the influence of the form of the interelectronic interaction, the calculations were performed with the Mataga-Nishimoto (MN) formula and a modified Mataga-Nishimoto (MMN) formula for two-electron integrals. We have found that curves of the points of the minimum total energy per unit cell for the alternating models are very similar, but band structures and energy gaps are quite different when the MN formula was substituted with the MMN formula for two-electron integrals.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560360510
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  • 4
    Electronic Resource
    Electronic Resource
    Rules for intrinsically (super) conducting polymers (1993)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 48 (1993), S. 245-248 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We propose a number of rules based on topological and structural considerations for the synthesis of intrinsically conducting polymeric materials. These rules can be summarized as follows: (i) The polymer has to have a glide plane or a twofold screw axis when infinitely extended; (ii) the unit cell must contain 4N + 2 valence electrons; (iii) the packing into the solid is restricted by symmetry rules that conserve the twofold degeneracy caused by rule (i). These rules are necessary (but not sufficient) for superconductivity. The inorganic polymer poly(sulfur-nitride), which is a metallic superconductor with a critical temperature of Tc = 0.33 K, is identified as a striking example of these rules. © 1993 John Wiley & Sons, Inc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560480826
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    Paper (German National Licenses)
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