High-Pressure Investigations of Magnetic Properties Examples Laves Phases and Iron Oxides

5 High-Pressure Investigations of Magnetic Properties (Examples Laves Phases and Iron Oxides) 

Temperatures as high as 2,500 K have been achieved by laser heating (LH). For such LHDAC experiments, the sample size was around 50-100 pm, the laser beam was focused to about 40 pm, and the synchrotron beam was microfocused to about 10 pm in diameter [70]. The photon-flux for the 14.4 keV ( Fe) synchrotron radiation at the focusing spot was about 10 photons s with a 1 meV energy bandwidth. This flux was reduced by a 5 mm path through diamond, via photo absorption, to 25% of its original value. For comparison the flux of the 21.5 keV radiation of Eu would be reduced to only 60%. 

The work of Wortmann et al. [65-67], Gavriliuk et al. [68, 69] and Sturhahn et al. [70] convincingly demonstrates the power of nuclear resonant scattering experiments with synchrotron radiation for high-pressure smdies of magnetism and lattice dynamics. An illustrative example was presented at the Fifth Seeheim Workshop by Wortmann [65] Fig. 9.28a shows NFS spectra of LuFe2 at 295 and 

9 Nuclear Resonance Scattering Using Synchrotton Radiation 

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