Abstract
Abstract High resolution optical spectra, ac magnetic susceptibility and magnetization in pulse fields were measured for polycrystalline Yb2BaNiO5 and Lu2BaNiO5 isostructural to the “green phase” R2BaCuO5 of high-Tc superconducting ceramics. Lu2BaNiO5 orders magnetically at 4.5 K while in Yb2BaNiO5 three-dimensional magnetic order does not, evidently, establish down to 1.9 K. Low-dimensional magnetic correlations are present in both compounds.
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