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  • 1
    Electronic Resource
    Electronic Resource
    STM Spectroscopy on Anisotropic Superconductors (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 519-523 
    Details
    ISSN: 1572-9605
    Keywords: STM ; electron tunneling ; organic superconductors ; pairing symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The superconducting phase of organic superconductors κ-(BEDT-TTF)2Cu(NCS)2 and (MDT-TTF)2AuI2 was investigated by the electron tunneling spectroscopy using low temperature STM. The tunneling differential conductance at the lateral surface of κ-(BEDT-TTF)2Cu(NCS)2 varies its shape depending on the tip direction. The in-plane anisotropy of the conductance is well explained by the d-wave symmetry with line nodes along the direction 45° from the c-axis. For (MDT-TTF)2AuI2, the tunneling conductance at T = 1.4 K shows the superconducting energy gap structure clearly. The finite conductance inside the gap edge suggests the gap anisotropy. The tunneling spectrum is explained by the d-wave pairing. The obtained gap Δ0 = 2 meV (2Δ0/kT c = 12) is larger than that of the weak coupling limit. The pseudogap structure is observed near T c .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007732201440
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The crystallographic structure of the natural air-hydrate in Greenland dye-3 deep ice core (1990)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 8 (1990), S. 17-24 
    Details
    ISSN: 1573-1111
    Keywords: Air-hydrate ; clathrate ; ice core ; guest molecule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We have carried out X-ray diffraction studies on single crystals of natural air-hydrate in deep ice cores recovered at Dye-3 Greenland. Integrated intensities for 470 diffracting planes were measured by an automated four-circle diffractometer. The space group determined is cubicFd3m and the lattice constant is 17.21(3) Å. These results indicate that the crystallographic structure is the Stackelberg's structure II, in contrast to the previously anticipated structure. This finding agrees with the recent results on the synthetic air-hydrate by Davidsonet al. It was also found by difference Fourier synthesis for guest molecules that electron density in a 16-hedral cage has multiple maxima displaced from the center of the cage while that in the 12-hedron was approximately spherical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01131284
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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