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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3680-3682 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Photoemission measurements in the two systems UPd3−x(Pt,Rh)x show that the 5f spectra are consistent with localized 5f electrons (peak in spectral weight is below EF for all x within the double hexagonal DO24 phase) while at both phase transitions the 5f peaks lock in at EF consistent with intinerancy. A satellite 5f peak which we attribute to d screening is observed in both localized and itinerant systems.
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  • 2
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heat capacity, resistivity and magnetic susceptibility data have been used to study electronic and magnetic properties of REBa2Cu3O7−x compounds. Neutron diffraction on the Ho compound shows identical crystal structure to YBa2Cu3O6.8. All the compounds are superconducting at Tc=(93±2) K. Magnetic transitions are observed in the heat capacity data at Tm=2.2, 0.95, 0.17, and 0.59 K for RE=Gd, Dy, Ho, and Er, respectively, and the magnetically ordered state is found to coexist with superconductivity. Estimates have been obtained for the magnetic moment in the crystal field ground state and the energy splitting of the first excited state crystal field level.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3070-3072 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A variety of ambient and high-pressure experimental results reveal the interplay between magnetism and superconductivity in Ho-doped samples of the pressure-induced superconductor, EuMo6S8. Ho concentrations up to 50 at. % of the rare-earth ions were used. High-resolution magnetic measurements are consistent with the crystalline electric field ground state for the Ho3+ ions being a magnetic doublet consisting largely of Jz =±8. The results of high-pressure magnetization experiments reveal negligible effects of reduced lattice constant on the rare earth-rare earth interactions. Resistivity in a 10 at. % sample for P=10 kbar shows the suppression of a P=0 structural transition, metallic conductivity down to low temperatures, and finally superconductivity at 8 K. The upper critical field, Hc2(T), for this sample was measured for P=7, 10, and 12 kbar and showed strong reentrant behavior [dHc2(T)/dT 〉0 as T→0 K]. A minimum with field in the resistivity above Hc2 was also observed at lowest temperatures. The Hc2(T) data are compared with those of EuMo6S8 at high pressure, which show positive curvature, and HoMo6S8, in which superconductivity is quenched by ferromagnetism at low temperatures.
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4136-4136 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rapidly quenched rare-earth (R)-iron boron alloys show large magnetic hysteresis when annealed around 700 °C. The hard magnetic properties of these alloys have been attributed to the presence of an anisotropic tetragonal phase with composition R2Fe14B. However, it is not yet clear when this phase is formed and how it affects the hard magnetic properties. Thermal analysis data, show a crystallization temperature around 400 °C which is much lower than the annealing temperature for the optimum properties. X-ray diffraction data do not show any significant changes after crystallization. In the present study we have used the Mössbauer effect to probe the products of crystallization and their changes during further annealing. Analysis of the 57Fe Mössbauer data has been performed considering a distribution of hyperfine magnetic fields. It is found that the average field changes from 250 kG for the amorphous alloy to 285 kG for the alloy annealed at 450 °C to 240 kG for the alloy annealed at 700 °C. The distribution is narrowed on increasing the annealing temperature and the Mössbauer spectra are indicative of phase segregation.
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  • 5
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Ilvaite, Ca(Fe2+,Fe3+)Fe2+Si2O8(OH) shows two magnetic phase transitions, which have been studied by Mössbauer spectroscopy within the temperature range 120–4 K. The continued charge localization between Fe2+ and Fe3+ ions in octahedral A-sites causes the Fe2+-Fe3+ interaction to be ferromagnetic, although the overall magnetic order is antiferromagnetic. The thermal evolution of the hyperfine fields at the Fe2+ (A) and Fe3+ (A) sites indicates B hf: 328 and 523 kOe respectively at 0 K and T N1= 116K. The corresponding values for Fe2+ (B) site are: B hf 186 kOe and T N2=36K. An additional hyperfine field exists at the Fe2+(B) site within the temperature range 116–36K due to short-range order induced by the spin ordering in A sites. The considerable difference between the two magnetic transition temperatures is due to spin frustration, because the Fe2+ (B) site occurs on a corner common between two triangles with respect to two sets of Fe2+ (A) and Fe3+ (A) sites with opposite spin directions.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 62 (1986), S. 375-383 
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using the formulation due to Fedro and Robinson of magnetic exchange in the presence of superconductivity, the mean field magnetic interaction energy has been calculated for rare earth (RE) ions in the RERh4B4 lattice. It is shown that increasing the strength of the superconducting interaction relative to the magnetic interaction results in a decrease of ferromagnetic coupling, and in some cases may drive ferromagnetic systems into antiferromagnetism.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 10 (1981), S. 903-913 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusion It is noteworthy that while only two classes of systems (the Chevrel phases and the rare-earth rhodium borides) have so far received extensive study, nonetheless a great many new phenomena have been encountered. This, however, should only be considered the beginning of a new and potentially very rich field, especially if one considers the vast number of possibilities of ternary compounds that can be produced. To take only one other example, recent work has shown that the compound Sc2Fe3Si5 is superconducting with a superconducting transition of 4.5 K (29). This at first may appear surprising since ever in the Chevrel phase materials, the addition of Fe atoms is detrimental to superconductivity. However, recent Mossbauer effect experiments (29) have shown that the Fe in this material is not magnetic, having a magnetic moment of less than 0.03 µB. These silicides have also been made with rare-earth ions in place of the Sc(28). The compounds show magnetic transitions and are currently under investigation. Several other interesting systems have been synthesized, and it appears that many more will be coming in the near future. The results reported above have shown the utility of hyperfine data in clarifying many of the new phenomena that occur, and it should be expected that as this new field grouws, these kinds of measurements will continue to play an active role (30).
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  • 8
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer spectra of hexavalent neptunyls X2(NpO2)Cl4 and X4(NpO2)(CO3)3 with X=Na, K, Cs, (NH4) and [C2H5)4N] are discussed and compared to EPR data. In cases where reliable values of hyperfine parameters can be extracted, the Mössbauer spectra give fine details of bonding structure. It is found that the O−Np−O bond is not linear and that exchanging the cation results in small but definite changes.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 49 (1989), S. 187-204 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The applications of Mössbauer spectroscopy to studies of superconductivity are reviewed. with an emphasis on magnetic properties. Important contributions utilizing this technique have included studies of spin-lattice relaxation rates for magnetic impurities as a measure of magnetic pair-breaking effects, studies of magnetic ordering and its relationship to superconductivity in ternary superconductors such as the Chevrel phase, Re-Rh4B4 and oxide superconducting compounds, evaluation of crystal field ground states for magnetic ions, and studies of substitutional sites and the role of impurities on superconductivity in the high temperature superconductors.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 9 (1981), S. 531-545 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Conclusions The purpose of this review is to acquaint the reader with the new field of ternary hydrides and to expose him to its relevance to modern energy technology. Studying their fundamental properties is one fascinating aspect in view of their novel and unusual nature. The methods of hyperfine interactions have an important role to play in their microscopic understanding, as we have illustrated through a few examples. The absorption mechanism of hydrogen has been shown to be closely related to the nature of surface overlayers and their catalytic activity. Similar measurements will be of importance also in many of the other catalytic reactions used in industry. The microscopic nature of hyperfine interaction tools also helps in determining the hydrogen site occupancy. In addition, such methods can in principle yield dynamic information which are useful in investigating relevant properties such as diffusion rates of hydrogen.
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