Magnetic Ordering in Boron-Rich Borides TbB66 and GdB66

K. Flachbarta, S. Gabania, T. Morib and K. Siemensmeyerc aInstitute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, SK-04001 Kosice, Slovak Republic bNational Institute for Materials Science, Namiki 1-1, JP-305-0044 Tsukuba, Japan cHelmholtz Zentrum Berlin, Glienicker Str. 100, D-14109 Berlin, Germany

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Magnetic ordering in TbB66 and GdB66 was investigated at very low temperatures. Measurements of ac susceptibility have shown rather clear features of magnetic ordering below 1 K, at 0.34 K for TbB66 and at 0.20 K for GdB66. However, no clear evidence of long range magnetic order was found by neutron scattering experiments. Reasons leading to these observations are discussed.

DOI: 10.12693/APhysPolA.118.875 PACS numbers: 75.20.Ck, 75.30.Cr, 77.84.Bw, 78.70.Nx