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Multiple high-temperature transitions driven by dynamical structures in NaI
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DOI：10.1103/PhysRevB.89.224106.png)
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摘要
En 中文
Multiple, consecutive high-temperature transitions in NaI involving dynamical order and/or localization in the energy-momentum spectrum but not in the average crystal structure are revealed by lattice dynamics, x-ray lattice spacing, and heat-capacity measurements. Distinctive energy-momentum patterns and lattice distortions indicate dynamical structures forming within randomly stacked planes, rather than the isolated point-defect-like intrinsic localized modes predicted. Transition entropies are accounted for by vibrational entropy changes, and the transition enthalpies are explained by the strain energy of forming stacking-fault-like planar distortions deduced from x-ray-diffraction peak shifts. The vibrational entropy of the dynamical structures stabilizes surrounding elastic distortions.
Keyword:
INTRINSIC LOCALIZED MODES
PATTERN-FORMATION
DISCRETE BREATHERS
CRYSTALS
INTERFERENCE
EQUILIBRIUM
LATTICES
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期刊
IF:
3.7
论文数:
15.4W
被引数:
41.0W
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