Low-energy nuclear spin excitations in NdAl2

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We investigated the low energy excitations in NdAl2 in the μeV range by a backscattering neutron spectrometer. The energy scans on a NdAl2 single crystal revealed inelastic peaks at E=3.3±0.1 μeV at T=3 K on both energy gain and energy loss sides. The inelastic peaks move gradually toward lower energy with increasing temperature and finally merge with the elastic peak at the electronic magnetic ordering temperature TN 79 K. We interpret the inelastic peaks to be due to the transition between hyperfine-split nuclear level of the N 143 d and N 145 d isotopes with spin I=7/2. © 2009 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics

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