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  • 1
    Electronic Resource
    Electronic Resource
    The structure and spin dynamics of lanthanide-bearing silicate glasses : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6825-6827 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of 3Na2O⋅R2O3⋅6SiO2 (R=Nd, Yb and Lu) glasses has been studied by time-of-flight neutron diffraction. The average Si-O and O-O nearest-neighbor coordination is found to be similar to those of the SiO4 tetrahedral units in vitreous SiO2 and other silicate glasses. The rare-earth (RE) ions coordinate with no more than seven nearest-neighbor oxygen atoms. The dynamic and static response of these glasses and their isochemical crystalline analogs has been investigated by inelastic neutron scattering and magnetic susceptibility measurements. The magnetic excitation spectra were analyzed by a ligand-field model using a method of descending symmetry. The correlation between short-range atomic order in a network glass and magnetic interactions of the RE ions with the local environment is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356797
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  • 2
    Electronic Resource
    Electronic Resource
    The diffusion of H2 in hexagonal ice at low temperatures (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 7177-7180 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The diffusion of hydrogen molecules in hexagonal D2O ice (Ih) in the temperature range of 25–60 K was investigated by quasielastic neutron scattering. The observed spectra consist of a narrow elastic peak and a broad quasielastic component. The single-particle diffusion coefficient for H2 in D2O ice was obtained using a simple model of diffusion and is remarkably high—comparable to the coefficient of H2 in a liquid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468303
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  • 3
    Electronic Resource
    Electronic Resource
    Neutron inelastic scattering studies of UF4 and NpF4 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 9338-9343 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Neutron inelastic scattering experiments have been performed on UF4 and NpF4. We had anticipated observing a number of sharp magnetic transitions in these experiments because the tetravalent metal ions are expected to have localized f states. However, very few transitions were observed, three and two in UF4 and NpF4, respectively. Except for the lowest-lying level (at 1.5 meV) in UF4 the transitions are wider than the instrumental resolution, suggesting a strong interaction between the electronic states and lattice vibrations. The levels observed do not correspond to those predicted by a crystal-field scheme recently proposed from optical spectroscopy. However, the paucity of observed levels in our experiments excludes us proposing an alternative scheme. The 1.5 meV energy level in UF4 is in good agreement with that deduced from specific heat and magnetic susceptibility data. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467964
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  • 4
    Electronic Resource
    Electronic Resource
    Neutron study of crystal-field transitions in ErPO4 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6069-6071 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystal-field splitting of the Er3+ ground multiplet 4I15/2 in ErPO4 is investigated by inelastic neutron scattering. Four excitations from the Γ7 ground state to the excited states and several transitions between the excited states have been identified. The observed transition energies and intensities are used to refine the parameters of the crystal-field potential. The calculated magnetic susceptibility χ(T) agrees well with experimental values from single-crystal measurements. A comparison of the neutron data with optical absorption and both nonresonance and resonance Raman scattering measurements has been made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353472
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamic quadrupolar excitation in PrO2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4830-4831 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A 5.4-meV excitation has been measured in PrO2 using inelastic neutron scattering. The excitation is identified as the energy splitting of the Γ8 ground state, corresponding to the dynamic Jahn–Teller process responsible for producing a reduced magnetic moment below the 14-K Néel point. Its magnitude and temperature dependence are in keeping with the predictions of Allen and of Sasaki and Obata for UO2, as scaled to PrO2. We had previously invoked this mechanism to explain the broadening of the 130-meV Γ8-to-Γ7 transition. Implications of these results for the magnetic response of PrO2, and other f-electron systems will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344751
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  • 6
    Electronic Resource
    Electronic Resource
    The antiferromagnetic form factor of La2NiO4 : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4860-4862 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron-diffraction techniques have been used to study the antiferromagnetic form factor of a La2NiO4 single crystal at 15 K. The antiferromagnetic form factor was obtained by measuring the integrated intensities of 16 magnetic reflections. A plateau is clearly seen at low Q (up to 3 A(ring)−1) in the experimentally determined form factor, similar to those observed for La2CuO4 and Sr2CuO2Cl2. As in the case of these latter compounds, the fit of the experimental data by a Ni2+ ionic form factor is not satisfactory. The experimental data are compared with a recent spin-polarized band calculation and with a covalency model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348204
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  • 7
    Electronic Resource
    Electronic Resource
    Electronic transitions of Ho in Pb2Sr2HoCu3O8 observed by inelastic neutron scattering : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6314-6316 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electronic behavior of the 5I8 Russell Saunders ground multiplet of Ho3+ in Pb2Sr2HoCu3O8 has been investigated using inelastic neutron scattering. We observe ten peaks in the excitation spectra that are associated with crystal field transitions. The peaks are only slightly broader than expected from instrument resolution, indicating that there are no strong interactions between the local Ho f states and the CuO conduction states. Comparing the energies and intensities of the experimental peaks with those expected from modeling convinces us that there are at least three states populated at the temperature of our experiment (15 K), making the assignments of transitions very difficult in the absence of further data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352684
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal-field excitations and magnetic properties of TmPO4 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4214-4222 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The magnetic-excitation spectrum of TmPO4 has been studied using inelastic neutron scattering techniques. Sharp crystal-field transitions were observed in spectra obtained at 15 and 100 K, yielding new information regarding the energy-level structure of the Tm3+ ground-multiplet splitting. The data were analyzed using a Hamiltonian that included the atomic free-ion and crystal-field interactions for an f12 configuration. Using the Tm free-ion parameters derived from optical spectroscopy of Tm3+ diluted in a LuPO4 host, a set of crystal-field parameters were obtained for Tm3+ in pure TmPO4. The calculated magnetic spectra of TmPO4 agree very well with the results of neutron and Raman measurements. The calculated bulk magnetic susceptibility of TmPO4 exhibits a large anisotropy at low temperature and is in good agreement with the experimental data. A significant contribution to the specific heat from the Tm3+ crystal-field states was found at temperatures below 100 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465028
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  • 9
    Electronic Resource
    Electronic Resource
    Crystal-field excitations and superconductivity in Nd1+xBa2−xCu3O7 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4536-4538 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The f-electron excitation spectra of Nd ions in superconducting NdBa2Cu3O7 and semiconducting Nd1.5Ba1.5Cu3O7 have been determined by inelastic neutron scattering. Transitions within the paramagnetic ground-state multiplet due to crystal-field splittings have been observed up to about 120 meV in these materials. The temperature dependence of the width of the low-lying transition at ∼21 meV shows significant differences in the superconducting and normal states. Adopting the CF level assignments for HoBa2Cu3O7, we rescaled the CF parameters to account for the larger radial wave functions of Nd3+ ions and obtained a level scheme for the Nd using the lowest 100 states of the f3 configuration. The calculated level structures for REBa2Cu3O7 (RE=Nd, Pr, Ho) are in good agreement with neutron and susceptibility measurements. Influence of superconducting ordering on crystal-field transitions in the Nd1+xBa2−xCu3O7 system is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344860
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  • 10
    Electronic Resource
    Electronic Resource
    Antiferromagnetic form factor of Sr2CuO2Cl2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4524-4526 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron diffraction techniques have been used to study the antiferromagnetic form factor of Sr2CuO2Cl2, which has the body-centered-tetragonal (I4/mmm) K2NiF4-type structure (the same as that of tetragonal La2CuO4 but with the out-of-plane oxygens replaced by Cl and the La by Sr). The antiferromagnetic form factor was obtained at 15 K by measuring the integrated intensities of the ( (1)/(2) (1)/(2) 0), ( (1)/(2) (1)/(2) 2), ( (1)/(2) (1)/(2) 3), ( (3)/(2) (3)/(2) 0), ( (3)/(2) (3)/(2) 6), ( (3)/(2) (5)/(2) 1), ( (3)/(2) (3)/(2) 8), and ( (5)/(2) (5)/(2) 0) magnetic reflections of a single crystal of Sr2CuO2Cl2. The experimentally determined magnetic form factor is similar to that of La2CuO4. The experimental data were compared with the Cu2+ magnetic form factor and with the results of band theoretical calculations. We find that the fit to the experimental data is improved if one assumes a dipolar spin polarization on the in-plane oxygen ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344857
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