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We report the results of 11B nuclear magnetic resonance (NMR) measurements of SrB6 and Ca0.995La0.005B6 below room temperature. Although the electrical resistivities of these two materials differ substantially, their 11B-NMR responses exhibit some strikingly common features. Both materials exhibit ferromagnetic order, but their 11B-NMR spectra reveal very small hyperfine fields at the boron sites. The spin-lattice relaxation T-11 varies considerably with external field but changes with temperature only below a few K. We discuss these unusual results by considering various different scenarios for the electronic structure of these materials. © 2001 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics