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Origin of anomalous anharmonic lattice dynamics of lead telluride

The origin of the anomalous anharmonic lattice dynamics of lead telluride is investigated using molecular dynamics simulations with interatomic force constants (IFCs) up to quartic terms obtained from first principles. The calculations reproduce the peak asymmetry of the radial distribution functions and the double peaks of transverse optical phonon previously observed with neutron diffraction and scattering experiments. They are identified to be due to the extremely large nearest-neighbor cubic IFCs in the [100] direction. The outstanding strength of the nearest-neighbor cubic IFCs relative to the longer-range ones explains the reason why the distortion in the radial distribution function is local.

preprint2015arXivOpen access
Takuma ShigaTakuru MurakamiTakuma HoriOlivier DelaireJunichiro Shiomi
cond-mat.mtrl-sciphysics.comp-ph
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Takuma ShigaTakuru MurakamiTakuma HoriOlivier DelaireJunichiro Shiomi

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