Phase-change materials are chalcogenide alloys used for nonvolatile memory applications due to their rapid and reversible structural transformation. ${{\rm In}_3}{{\rm SbTe}_2}$ is a promising candidate that exhibits transitions dependent on thermal conductivity. The minimum lattice thermal conductivity of amorphous ${{\rm In}_3}{{\rm SbTe}_2}$ is investigated by surface acoustic propagation. ${{\rm In}_3}{{\rm SbTe}_2}$ thin films were deposited by radio frequency magnetron sputtering on (100) Si. Rutherford backscattering spectrometry and x-ray reflectivity were used to establish the elemental composition, deposition rate, and mass density. Using the Debye model, the thermal conductivity is extracted from fitted phase velocities measured by surface Brillouin scattering. The low thermal conductivity is revealed to be suitable for Joule heating.

中文翻译：

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表面布里渊散射对In ₃ SbTe ₂的最小晶格热导率

相变材料是硫属化物合金，因其快速且可逆的结构转变而用于非易失性存储应用。$ {{\ rm In} _3} {{\ rm SbTe} _2} $是很有前途的候选者，其表现出依赖于导热率的转变。通过表面声传播研究了非晶态$ {{\ rm In} _3} {{\ rm SbTe} _2} $的最小晶格热导率。$ {{\ rm In} _3} {{\ rm SbTe} _2} $通过射频磁控溅射在（100）Si上沉积薄膜。使用卢瑟福背散射光谱和X射线反射率来确定元素组成，沉积速率和质量密度。使用德拜模型，从表面布里渊散射测量的拟合相速度中提取热导率。较低的热导率表明适合焦耳加热。