Magnon scattering

These were observed by Oseroff and Pershan 62> in MnF2 doped with Ni2+ and Fe2+. They detected two-magnon scattering of the dopants and emphasize the excellent agreement between theory and experiment. It is obvious that the intensity problem was remarkable in this experiment. Magnon scattering is already very weak and here it has to be detected from a dopant. 

At low temperatures, B Jiy) becomes exponentially small and pu>ng T) may be neglected, reflecting the insignificance of longitudinal spin fluctuations as the moment approaches saturation at T = 0. The transverse spin fluctuations, however, remain but are more accurately described within the spin wave approximation, because of the inadequacy of the molecular field model in describing the collective excitations. Calculations (Kasuya 1959, Yamada and Takada 1972) of the electron - magnon scattering cross-section yield a resistivity contribution ... 

Phonon and magnon scattering 2.3.3. Effects of the material s optical 515 4.3.3. Evidence for nrxmal-state pairing 5. Electronic scattering in the superconducting 541... 

Phonon-magnon scattering, heat transfer by magnons in lanthanide compounds (r[Pg.107]

If heat transfer is to occur by magnons or phonon-magnon scattering it is... 

By contrast, in EuO the effect of phonon -magnon scattering is small and the heat at low temperatures is transferred mainly be magnons. At T = 0.93 K the contribution of c , to K in EuO is about 75%, fig. 22. This value is a record for the investigated magnetics at the present time. However, simple dependences like those shown in figs. 21 and 22 (Dixon and Landau 1976, Walton et al. 1973, Metcalfe and Rosenberg... 

Let us consider, for example, the separation of ic in the alloy ErNi Tq 105 K) (Mori et al. 1984). Figures 25a, b, c illustrate the procedure of the determination of /c . One could expect a decreased in the magnetic lanthanide metals due to electron-magnon scattering. However, we have not succeeded in finding reliable literature data on this question. 

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