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Light atom quantum oscillations in UC and US

Yiu, Yuen and Aczel, A. A. and Granroth, G. E. and Abernathy, D. L. and Stone, M. B. and Buyers, W. J. L. and Lin, J. Y. Y. and Samolyuk, G. D. and Stocks, G. M. and Nagler, S. E. (2016) Light atom quantum oscillations in UC and US. Physical Review B, 93 (1). Art. No. 014306. ISSN 2469-9950.

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High-energy vibrational scattering in the binary systems UC and US is measured using time-of-flight inelastic neutron scattering. A clear set of well-defined peaks equally separated in energy is observed in UC, corresponding to harmonic oscillations of the light C atoms in a cage of heavy U atoms. The scattering is much weaker in US and only a few oscillator peaks are visible. We show how the difference between the materials can be understood by considering the neutron scattering lengths and masses of the lighter atoms. Monte Carlo ray tracing is used to simulate the scattering, with near quantitative agreement with the data in UC, and some differences with US. The possibility of observing anharmonicity and anisotropy in the potentials of the light atoms is investigated in UC. Overall, the observed data is well accounted for by considering each light atom as a single atom isotropic quantum harmonic oscillator.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Granroth, G. E.0000-0002-7583-8778
Abernathy, D. L.0000-0002-3533-003X
Stone, M. B.0000-0001-7884-9715
Lin, J. Y. Y.0000-0001-9233-0100
Additional Information:© 2016 American Physical Society. Received 6 August 2015; revised manuscript received 18 December 2015; published 19 January 2016. We are grateful to P. De V. Duplessis for growth of the excellent sample. This research was supported by the Basic Energy Sciences, U.S. Department of Energy. A.A.A., G.E.G., D.L.A., M.B.S. and S.E.N. were fully supported and J.Y.Y.L was partially supported by the Scientific User Facilities Division. G.D.S. and G.M.S. were fully supported by the Materials Sciences and Engineering Division. Neutron scattering experiments were performed at the Spallation Neutron Source, which is sponsored by the Scientific User Facilities Division. Y.Y. was supported by Office of Experimental Program to Stimulate Competitive Research (Grant No. DE-FG02-08ER46528), Basic Energy Sciences, U.S. Department of Energy.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-08ER46528
Issue or Number:1
Record Number:CaltechAUTHORS:20160211-111249950
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Official Citation:Light atom quantum oscillations in UC and US Yuen Yiu, A. A. Aczel, G. E. Granroth, D. L. Abernathy, M. B. Stone, W. J. L. Buyers, J. Y. Y. Lin, G. D. Samolyuk, G. M. Stocks, and S. E. Nagler Phys. Rev. B 93, 014306 – Published 19 January 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64421
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 00:14
Last Modified:09 Mar 2020 13:18

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