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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron paramagnetic resonance of Ce3+ in La(CF3SO3)3⋅9H2O : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5998-6000 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The rare-earth trifluoromethanesulfonates R(CF3SO3)3⋅9H2O (RTFMS) have a hexagonal structure similar to the ethylsulfates R(C2H5SO4)3⋅9H2O (RES). The lowest Kramers doublet in CeTFMS is ||J=5/2; Jz = ±5/2〉 separated from an excited doublet ||J=5/2; Jz= ±1/2〉 by Δ/k(approximately-equal-to)21 K. We have measured electron paramagnetic resonance on 1% and 2% Ce3+ in LaTFMS crystals at 9.214 GHz. At 4.2 K, absorption by two doublets is found yielding g(parallel)(5/2) = 3.813 ± 0.001; g⊥(5/2) = 0.262 ± 0.002; g(parallel)(1/2) = 0.977 ± 0.003; g⊥(1/2) = 2.151 ± 0.002. The temperature variation of intensities shows the ground doublet to be ||±5/2〉, as in concentrated CeTFMS, but Δ/k=9.6±0.7 K. The doublet order is opposite to that for dilute Ce:LaES but the same as in CeES or Ce:YES and Ce:EuES. In 2% Ce:LaTFMS, satellite resonances due to coupled nn Ce–Ce pairs are also observed. Analysis of the pair data indicates that virtual phonon exchange, while the dominant nondipolar contribution to intrapair coupling, is smaller than for Ce pairs in CeES. This is consistent with the fact that Δ is larger in CeTFMS or Ce:LaTFMS than in CeES.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350073
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic ordering in Ho(CF3SO3)3⋅9H2O and Ho(C2H5SO4)3⋅9H2O (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5850-5852 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic susceptibilities χ(parallel) and χ⊥, both ac (80 Hz) and static, of hexagonal crystals of the structurally similar Ho(C2H5SO4)3⋅9H2O, HoES, and Ho(CF3SO3)3⋅9H2O, HoTFMS, have been measured down to ∼0.1 K. Both order ferromagnetically along the c axis at Tc=0.23 K. Analysis of the susceptibilities above Tc shows g(parallel)≈15.5 and g⊥≈0, ground doublet-excited singlet separation 8.4 K in HoES and 15 K in HoTFMS, and dipolar interionic interactions. Cp for both salts was also measured and found to exhibit similar sharp cooperative λ peaks at 0.23 K due to ordering of the Ho3+ moments. This peak sits atop the rounded Schottky anomaly of a system of nuclear spins in a fixed hyperfine field. The independence of the electron and nuclear contributions to Cp is associated with the Ising character of the Ho3+ ground non-Kramers doublet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345986
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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