NMR studies of EuB6 at low temperatures

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We report results of 153Eu and 11B nuclear magnetic resonance (NMR) measurements on EuB6 at temperatures between 0.1 and 150 K and in external magnetic fields between H=0 and 7 T. The evolution of the 153Eu NMR spectra at low temperatures and low fields provides evidence for an unexpected and complex electronic ground state of EuB6, involving the coexistence of two magnetically very similar phases. The temperature and magnetic-field dependences of the 11B spin-lattice relaxation rate T-11(T, H) are very well accounted for by magnon-driven relaxation. A spin-wave theoretical interpretation of the 153Eu-NMR spectra and the 11B T-11measurements indicate that a gap of the order of 1 K exists in the magnon excitation spectrum. © 1999 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics

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