Abstract
Previous μSR studies on the RFe 6Al 6 (R=Tb, Ho, Er) ferrimagnets (T N ≈340 K) showed effects of frustration due to competing exchange between the R and Fe sublattices. This puts the compounds on the borderline between spin glass and long-range order. In continuation of this work, μSR and 57 Fe Mössbauer spectroscopy were carried out on YFe 6Al 6 and YFe 7Al 5. In these compounds, no moments exist on the normally strongly magnetic R sublattice. Neutron diffraction was unable to detect magnetic Bragg peaks, but the μSR and Mössbauer spectra clearly reveal a ferrimagnetic transition near 340 K in both materials. Not all of the Fe ions order at this temperature. The Fe ions on the Fe sublattice (8f) order only below ∼70 K . Since competing exchange is absent, the Fe sublattices possess inherent frustration reflected in distributions of moment size and orientation, short correlation lengths and strong spin fluctuations.
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