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  • PACS. 29.30.Hs Neutron spectroscopy[:AND:] 68.35.Ja Surface and interface dynamics and vibrations - 33.15.Fm Bond strengths, dissociation energies  (1)
  • doping  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Inelastic neutron scattering from on vapour deposited (1998)
    Springer
    The European physical journal 3 (1998), S. 109-117 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 29.30.Hs Neutron spectroscopy[:AND:] 68.35.Ja Surface and interface dynamics and vibrations - 33.15.Fm Bond strengths, dissociation energies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Inelastic neutron scattering spectra at 17 meV and 68 meV incident energies of molecular hydrogen adsorbed on vapour deposited substrates of pure CO2, 90:10 and 50:50 CO2:Kr are reported. The ortho-para transition is shifted from 14.7 meV in the free H2-molecule to 9.4 meV in a presumably commensurate ortho-H2 monolayer on the CO2 surface. The quadrupole-quadrupole interaction of ortho-H2 molecules with the CO2 substrate results in a strongly anisotropic potential. In addition to rotations the dynamics of this layer comprise a local Einstein mode and phonons in resonance with the substrate, giving rise to intense multiphonon transitions. Quasielastic scattering on warmer samples is assigned to a liquidlike adsorption layer, in which the H2 rotations are strongly perturbed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050289
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  • 2
    Electronic Resource
    Electronic Resource
    Doping and Isotope Dependence of the Pseudogap in High-Tc Cuprates Observed by Neutron Crystal-Field Spectroscopy: A Fast Local Probe (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 727-730 
    Details
    ISSN: 1572-9605
    Keywords: doping ; isotope effect ; pseudogap ; high-T c cuprates ; crystal-field spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The temperature dependence of the relaxation rate of crystal-field excitations in the high-T c superconductors HoBa2Cu4O8 and HoBa2Cu3O x (6.4 〈 x 〈 7) was investigated by inelastic neutron scattering techniques. The data show clear evidence for the opening of an electronic gap in the normal state at T* 〉 T c in the underdoped regime as well as for slightly overdoped samples. For HoBa2Cu4O8 T* increases from 170 to 220 K upon oxygen isotope substitution (16O vs 18O). This huge isotope shift (which is absent in NMR and NQR experiments) suggests that the mechanism leading to an isotope effect on the pseudogap has to involve a time scale in the range 10−8 ≫ τ 〉 10−13 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007806029650
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