Light atom quantum oscillations in UC and US

Yiu, Yuen; Aczel, Adam A.; Granroth, Garrett E.; Abernathy, Douglas L.; Stone, Matthew B.; Buyers, W. J. L.; Lin, J. Y. Y.; Samolyuk, German D.; Stocks, George Malcolm; Nagler, Stephen E.

doi:10.1103/PhysRevB.93.014306

Title: Light atom quantum oscillations in UC and US

Journal Article · Tue Jan 19 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.014306· OSTI ID:1235830

Yiu, Yuen ^[1]; Aczel, Adam A. ^[2]; Granroth, Garrett E. ^[2]; Abernathy, Douglas L. ^[2]; Stone, Matthew B. ^[2]; Buyers, W. J. L. ^[3]; Lin, J. Y. Y. ^[4]; Samolyuk, German D. ^[2]; Stocks, George Malcolm ^[2]; Nagler, Stephen E. ^[2]

Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Canadian Nuclear Lab., Chalk River, ON (Canada)
California Institute of Technology (Caltech), Pasadena, CA (United States)

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. Lastly, the observed data is well accounted for by considering each light atom as a single atom isotropic quantum harmonic oscillator.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-08ER46528

OSTI ID:: 1235830

Alternate ID(s):: OSTI ID: 1235638

Journal Information:: Physical Review B, Vol. 93, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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