TaSe2-xTex的多型性、多态性与超导电性
Polytypism, polymorphism and superconductivity in TaSe2-xTex
摘要：
材料的多晶型通常导致显著不同的物理性质-TiO 2的金红石和金红石多晶型物就是一个很好的例子。多型性是一种特殊类型的多态性，发生在层状材料中，当重复结构层的几何形状保持不变，但整个晶体结构的层堆叠顺序可以变化时; SiC是具有许多多型体的材料的一个例子。虽然多晶型物可以具有根本不同的物理性质，但多型性以戏剧性的方式影响物理性质的情况要少得多。在这里，我们研究的多型性和多态性对TaSe 2，层状dichalcogenides的大家庭的原型成员之一的超导电性的影响。我们表明，它是可能的访问2稳定的多型体和2稳定的多晶型体的TaSe 2-xTex固溶体，并发现3R多型体显示出超导转变温度是近17倍，比更常见的2 H多型体。这种戏剧性变化的原因是不明显的，但我们提出，它产生于一个显着的依赖性Tc的细微差别的特点，目前的单层，或从一个令人惊讶的效果层堆叠顺序的电子性能，而不是预期将主导的性能，在这种材料的单层。
英文摘要：
Polymorphism in materials often leads to significantly different physical properties - the rutile and anatase polymorphs of TiO2 are a prime example. Polytypism is a special type of polymorphism, occurring in layered materials when the geometry of a repeating structural layer is maintained but the layer stacking sequence of the overall crystal structure can be varied; SiC is an example of a material with many polytypes. Although polymorphs can have radically different physical properties, it is much rarer for polytypism to impact physical properties in a dramatic fashion. Here we study the effects of polytypism and polymorphism on the superconductivity of TaSe2, one of the archetypal members of the large family of layered dichalcogenides. We show that it is possible to access 2 stable polytypes and 2 stable polymorphs in the TaSe2-xTex solid solution, and find that the 3R polytype shows a superconducting transition temperature that is nearly 17 times higher than that of the much more commonly found 2H polytype. The reason for this dramatic change is not apparent, but we propose that it arises either from a remarkable dependence of Tc on subtle differences in the characteristics of the single layers present, or from a surprising effect of the layer stacking sequence on electronic properties that instead are expected to be dominated by the properties of a single layer in materials of this kind.
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