Phys. Rev. B 79, 132408 (2009) [4 pages]Low-energy nuclear spin excitations in NdAl2Received 13 December 2008; revised 28 March 2009; published 24 April 2009 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 143Nd and 145Nd isotopes with spin I=7/2. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.132408
DOI:
10.1103/PhysRevB.79.132408
PACS:
75.25.+z
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