Phys. Rev. B 79, 212409 (2009) [3 pages]Low-energy nuclear spin excitations in CoOReceived 28 April 2009; revised 1 June 2009; published 24 June 2009 We investigated the low-energy excitations in CoO in the μeV range by a back-scattering-neutron spectrometer. The energy scans on a CoO single crystal revealed inelastic peaks at E=2.05±0.02 μeV at T=3.5 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≈290 K. We interpret the inelastic peaks to be due to the transition between hyperfine-split nuclear level of the 59Co isotopes with spin I=7/2. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.212409
DOI:
10.1103/PhysRevB.79.212409
PACS:
75.25.+z
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