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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic resonance studies of some antiferromagnetic Gd-monopnictides and Gd-monochalcogenides (1977)
    Springer
    Journal of low temperature physics 26 (1977), S. 525-532 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the results of electron paramagnetic resonance studies of GdX (X=As, Sb, Bi, S, Se). The temperature dependence of the linewidth ΔH and effective g-factorg eff are discussed. Values for the Néel temperatureT N are inferred from coincident anomalies in ΔH andg eff. In the cases of X=S and Se, our estimates ofT N are significantly lower than theT N inferred from static susceptibility measurements. A possible source of the discrepancy is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655425
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of disorder on the trapping of Frenkel excitons in three-dimensional systems (1991)
    Springer
    Journal of statistical physics 65 (1991), S. 1155-1159 
    Details
    ISSN: 1572-9613
    Keywords: Frenkel excitons ; three-dimensional systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A numerical study is made of the effect of disorder on the trapping of Frenkel excitons in three-dimensional systems atT=0 K. A Gaussian distribution of optical transition frequencies is assumed. The disorder enhances the decay of ak = 0 exciton created by pulsed optical excitation, but reduces the overall exciton trapping rate. An interpretation of the results in terms of increased exciton scattering and reduced exciton mobility is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049604
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  • 3
    Electronic Resource
    Electronic Resource
    Freezing Temperature in Dilute Ising Spin Glasses with Long-Range Interactions (1998)
    Springer
    Journal of statistical physics 90 (1998), S. 873-888 
    Details
    ISSN: 1572-9613
    Keywords: Spin glasses ; long-range interactions ; freezing temperature ; localized and extended states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The onset of spin-glass freezing in dilute Ising systems with long-range interactions is investigated with the use of numerical simulations. We show that taking pair correlations explicitly into account results in the renormalization of the interaction matrix and suppression of the density of localized states compared with conventional mean field theory. Application of the theory to the RKKY interaction in the dilute limit raises the question of the appropriate boundary eigenvalue of the effective interaction matrix that separates localized and extended states. We identify the onset of spin-glass freezing with the temperature T g at which this boundary eigenvalue is equal to one. Numerical simulations reproduces the linear concentration dependence of T g in the very dilute limit, in agreement with scaling relations, and show a significant improvement over the conventional mean-field theory in the value obtained for the freezing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1023237306231
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  • 4
    Electronic Resource
    Electronic Resource
    Trapping of excitation in the averageT-matrix approximation (1983)
    Springer
    Journal of statistical physics 30 (1983), S. 345-354 
    Details
    ISSN: 1572-9613
    Keywords: trapping ; donor-donor transfer ; donor-acceptor transfer ; averageT-matrix approximation ; diffusion ; random walk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the trapping of excitation by a random array of acceptor ions embedded in an assembly of donors. The problem is formulated in terms of coupled rate equations. Exact results for the fraction of excited donors are obtained in the zero and rapid donor-donor transfer limits for arbitrary ratios of the donor to trap concentration. The averageT-matrix approximation (ATA) is introduced to interpolate between these limits in situations where the concentration of traps is much less than the concentration of donor ions. In three-dimensional systems the ATA reproduces the results of earlier calculations in appropriate limits. The extension of the theory to higher trap concentration is discussed, as are problems connected with the application to one- and two-dimensional arrays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01012308
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  • 5
    Electronic Resource
    Electronic Resource
    μ+SR in imperfect solids (1979)
    Springer
    Hyperfine interactions 6 (1979), S. 335-339 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The use of μ+SR as a probe of point defects in metals is discussed. The importance of separating the effects due to the presence of the muon from those intrinsic to the defect-host system is stressed. It is suggested that studies of magnetic impurities in non-magnetic hosts may yield data which are relatively probe-independent. A theoretical analysis of the depolarization of muons coupled to magnetic impurities is outlined. It is pointed out that measurements of the field dependence of the depolarization rate can give information about impurity spin correlation times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01028816
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