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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of the cyclic spincluster Fe6:bicine (2003)
    Springer
    The European physical journal 33 (2003), S. 321-330 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 33.35.+r Electron resonance and relaxation – 36.40.-c Atomic and molecular clusters – 75.20.-g Diamagnetism, paramagnetism, and superparamagnetism – 75.75.+a Magnetic properties of nanostructures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic properties of the cyclic compound [Fe6(bicine)6] LiClO4 . 2MeOH are reported. The cluster Fe6(bicine)6 forms an antiferromagnetically coupled ring structure of Fe III ions. The magnetic susceptibility is measured between 2 and 300 K and yields the exchange coupling of J/k B = - 27.5±0.5 K. The field dependence of the magnetic moment is studied at 3 and 6 K in magnetic fields up to 5 T. The zero-field splitting of the first excited spin states with S = 2 and 3 are determined by ESR at 94 GHz. The intra-molecular interactions of the Fe III ions are analyzed and the on-site anisotropy of the Fe III due to the ligand-configuration is determined to d /k B = - 0.633±0.008K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2003-00172-9
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  • 2
    Electronic Resource
    Electronic Resource
    Competing polarization mechanisms in the heavy-fermion paramagnet CeCu 6 (2002)
    Springer
    The European physical journal 26 (2002), S. 199-209 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 76.60.-k Nuclear magnetic resonance and relaxation – 75.20.Hr Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Nuclear magnetic resonance (NMR) and relaxation of 63Cu and 65Cu in a powder sample of the heavy-fermion paramagnet CeCu6 is measured and analysed quantitatively. Five different Cu sites are accessible to a detailed analysis. We derive quadrupolar splitting frequencies, Ce to Cu transferred hyperfine field coupling constants, and transversal as well as longitudinal relaxation behaviour. Only small relaxation anomalies are observed at the orthorhombic to monoclinic structural phase transition of CeCu6. We point to the different importance of transferred hyperfine interaction and local conduction electron density for static or dynamic part, respectively, of Cu hyperfine interaction. The different sign of the transferred hyperfine interaction from Ce3+ to different Cu neighbours reveals the different competing interaction mechanisms, giving rise to the heavy-fermion paramagnetic behavior of CeCu6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020081
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    Paper (German National Licenses)
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