Observation of high-temperature spin fluctuations in UBe13 by nuclear-spin relaxation
- 15 April 1988
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 63 (8) , 3890-3892
- https://doi.org/10.1063/1.340594
Abstract
We report the extension of measurements of the 9Be spin‐lattice relaxation rate in UBe13 from 300 up to 1000 K. They reflect the fluctuating local magnetic field at the site of the 9Be nuclei. Above about 100 K, there appears a new contribution in addition to the rate observed at lower temperatures. The high temperature contribution is modeled in terms of the thermal excitation of low‐lying states of the U3+ ion along lines used by Felton et al. to explain their measurements of the specific heat. Our results indicate a splitting of 200±20 K between the ground and excited states of the system, and a lifetime of 8×10−14 s for the excited states (width =95 K).This publication has 7 references indexed in Scilit:
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