Direct Observation of a Nuclear Spin Excitation in Ho2Ti2O7

• A single nondispersive excitation is observed by means of neutron backscattering, at E-0=26.3 mu eV in the spin ice Ho2Ti2O7 but not in the isotopically enriched (Dy2Ti2O7)-Dy-162 analogue. The intensity of this excitation is rather small, less than or similar to 0.2% of the elastic intensity. It is clearly observed below 80 K but resolution limited only below similar to 65 K. The application of a magnetic field up to mu H-0=4.5 T, at 1.6 K, has no measurable effect on the energy or intensity. This nuclear excitation is believed to perturb the electronic, Ising spin system resulting in the persistent spin dynamics observed in spin ice compounds.

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NATURVETENSKAP  -- Fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences (hsv//eng)

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