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  • 65.40.−f  (2)
  • Springer  (2)
  • American Physical Society (APS)
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  • Springer  (2)
  • American Physical Society (APS)
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  • 1
    Electronic Resource
    Electronic Resource
    Low-temperature specific heat of the cluster compound Au55 (P(C6H5)3)12Cl6 (1991)
    Springer
    The European physical journal 20 (1991), S. 329-331 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 65.40.−f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Specific-heat measurements on the cluster compound Au55(P(C6H5)3)12Cl6 at temperatures 0.06 K ≤T≤3 K and in magnetic fields 0≤B≤6 T are reported. While above 0.6 K the specific heatC is dominated by the inter-cluster vibrational contribution observed previously, an anomalous increase ofC towards lowT is observed below 0.3 K, withC ∼T −2. This contribution develops into a Schottky-like anomaly forB≥0.4 T, indicating that it might be attributed to local moments which are also observed in ESR measurements. From the height of the anomaly one can infer that approximately one tenth of the Au55 clusters carry a magnetic moment. For 0.6 K≤T≤1 K andB=0 our data indicate the absence of a linear electronic specific-heat contribution expected for bulk Au. This possibly constitutes the first direct observation of the quantum-size effect on electronic energy levels in the specific heat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01544003
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  • 2
    Electronic Resource
    Electronic Resource
    The quadrupolar and hyperfine splittings in the metal cluster compound Au55(PPh3)12Cl6 (1993)
    Springer
    The European physical journal 26 (1993), S. 27-29 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 65.40.−f ; 76.80.+y
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract There are 5 different Au-sites in the Au55 core of Au55(PPh3)12Cl6. The 13 inner atoms are almost identical to that of bulk gold. At the surface the attachment of the ligands is responsible for further differentiation. We have calculated the low temperature specific heat using the Mössbauer determined electrical quadrupolar splitting of the surface atoms. Due to too long a quadrupolar relaxation time, no such contribution is seen in the zero field results (down to 0.06 K) of Goll et al., Z. Phys. D 20, 329 (1991). The latter zero and in-field data are interpreted as the contribution of an electronic spin, hyperfine coupled to a nuclear spin 3/2. The effective abundance is about one spin per ten clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425607
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