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Crystallographic structure of (after Ref. 8). Large dark spheres are Pr atoms, while the smaller spheres representing Fe atoms are indicated in two different colors (darker for those atoms belonging to a Pr–Fe plane, lighter for those belonging to a Fe-only plane). The three inequivalent RE sites are indicated by Roman numerals.
Dots: Low-angle INS spectra of . Grey area: Phonon background, as estimated by measurements.
INS spectrum of . All nonmagnetic contributions have been estimated and subtracted by analyzing the corresponding measurements. The solid line is a fit with three Gaussians, centered at 20.0, 21.4, and , respectively.
Linear dependence of as a function of above .
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