NaI高温振动谱中的本征局域模
Intrinsic Localized Modes Observed in the High Temperature Vibrational Spectrum of NaI
摘要：
对碘化钠高温晶格激发的非弹性中子测量表明，在555 K的热平衡下，在光谱声子隙中心附近的单一频率处出现一个三维局域的本征模，沿[111]极化。在较高的温度下，本征局域模的增益强度。在室温NaI晶体上的高能非弹性中子和X射线散射测量表明，本征局域模的基态的产生能量为299 meV。
英文摘要：
Inelastic neutron measurements of the high-temperature lattice excitations in NaI show that in thermal equilibrium at 555 K an intrinsic mode, localized in three dimensions, occurs at a single frequency near the center of the spectral phonon gap, polarized along [111]. At higher temperatures the intrinsic localized mode gains intensity. Higher energy inelastic neutron and x-ray scattering measurements on a room-temperature NaI crystal indicate that the creation energy of the ground state of the intrinsic localized mode is 299 meV.
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