Light atom quantum oscillations in UC and US

被引：5

作者：

Yiu, Yuen ^{[1
]}

Aczel, A. A. ^{[2
]}

Granroth, G. E. ^{[3
]}

Abernathy, D. L. ^{[2
]}

Stone, M. B. ^{[2
]}

Buyers, W. J. L. ^{[4
]}

Lin, J. Y. Y. ^{[5
]}

Samolyuk, G. D. ^{[6
]}

Stocks, G. M. ^{[6
]}

Nagler, S. E. ^{[2
]}

机构：

[1] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[3] Oak Ridge Natl Lab, Neutron Data Anal & Visualizat Div, Oak Ridge, TN 37831 USA

[4] Canadian Nucl Labs, Canadian Neutron Beam Ctr, Chalk River, ON K0J 1J0, Canada

[5] CALTECH, Pasadena, CA 91125 USA

[6] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 01期

关键词：

SALT-STRUCTURE COMPOUNDS; NEUTRON-SCATTERING; URANIUM NITRIDE; THERMODYNAMIC PROPERTIES; MAGNETIC EXCITATIONS; VIBRATIONS; PSEUDOPOTENTIALS; DYNAMICS; HYDROGEN; HYDRIDE;

D O I：

10.1103/PhysRevB.93.014306

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：10

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