Specific Heat of (GeTe)x(Sb2Te3)1–x Phase-Change Materials: The Impact of Disorder and Anharmonicity
Specific Heat of (GeTe)x(Sb2Te3)1–x Phase-Change Materials: The Impact of Disorder and Anharmonicity
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DOI：
10.1021/cm500175j
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
P. Zalden;K. S. Siegert;S. Rols;H. Fischer;F. Schlich;Tengfei Hu;M. Wuttig
中科院分区：
文献类型：
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作者：
P. Zalden;K. S. Siegert;S. Rols;H. Fischer;F. Schlich;Tengfei Hu;M. Wuttig
相变材料（PCM）是不良的玻璃形成体，并且它们的快速结晶伴随着光学和电学性质的急剧变化，这为新型非易失性数据存储器件提供了机会。这些材料中的许多位于GeTe和Sb2Te3之间的伪二元线上，并形成亚稳态的岩盐状原子排列，其中Te原子占据两个子晶格中的一个，另一个随机填充有Ge和Sb原子以及空位。由此产生的无序对例如输运性质具有深远的影响，导致电荷载流子的无序诱导的局部化。在这里，我们讨论的无序对热性能的影响。我们研究了GeTe和Sb_2Te_3之间赝二元系的几种相变材料。一个显着的比热增强被发现为无序的岩盐状相相比，有序的三角相，其中Ge和Sb原子占据单独的层。这种增强的幅度与…
Phase-change materials (PCM) are bad glass formers, and their rapid crystallization is accompanied by a drastic change in optical and electrical properties, which opens opportunities for novel nonvolatile data storage devices. Many of these materials are located on the pseudobinary line between GeTe and Sb2Te3 and form a metastable rock-salt-like atomic arrangement in which Te atoms occupy one of the two sublattices and the other is randomly filled with Ge and Sb atoms as well as vacancies. The resulting disorder has profound impact on, for example, transport properties, causing disorder-induced localization of charge carriers. Here we discuss the impact of disorder on thermal properties. We have investigated several PCMs from the pseudobinary line between GeTe and Sb2Te3. A significant enhancement of the specific heat is found for the disordered rock-salt-like phase compared with the ordered trigonal phase, in which Ge and Sb atoms occupy separate layers. The magnitude of this enhancement is correlated w...