PdSe2-xTex体系中新的多晶相和丰富的phase diagram
New polymorphic phase and rich phase diagram in the PdSe2-xTex system
摘要：
我们报告的PdSe 2-xTex系统的实验和理论研究相结合。随着Te含量的增加，结构的演变，首先从正交相（空间群Pbca）到单斜相（空间群C2/c），然后到三角相（空间群P-3 m1），观察到伴随着明显不同的电输运行为。单斜相（C2/c）是一种全新的多晶相，在Te组成的窄范围（0.3 \leq x \leq 0.8）内发现。该相具有与迄今为止所有已知的过渡金属二硫属化物不同的堆积顺序。电子计算和详细的运输分析的新的多晶型PdSe 1.3Te 0.7相。在三角相区，在Te含量为1.0 \leq x \leq 1.2的窄范围内，也观察到临界温度提高的超导性。丰富的相图，新的多晶型结构以及异常增强的超导电性将进一步激发人们对探索新型多晶型物的兴趣，并研究其在过渡金属二硫族化合物家族中的输运和电子性质。
英文摘要：
We report a combined experimental and theoretical study of the PdSe2-xTex system. With increasing Te fraction, structural evolutions, first from an orthorhombic phase (space group Pbca) to a monoclinic phase (space group C2/c) and then to a trigonal phase (space group P-3m1), are observed accompanied with clearly distinct electrical transport behavior. The monoclinic phase (C2/c) is a completely new polymorphic phase and is discovered within a narrow range of Te composition (0.3 \leq x \leq 0.8). This phase has a different packing sequence from all known transition metal dichalcogenides to date. Electronic calculations and detailed transport analysis of the new polymorphic PdSe1.3Te0.7 phase are presented. In the trigonal phase region, superconductivity with enhanced critical temperature is also observed within a narrow range of Te content (1.0 \leq x \leq 1.2). The rich phase diagram, new polymorphic structure as well as abnormally enhanced superconductivity could further stimulate more interest to explore new types of polymorphs and investigate their transport and electronic properties in the transition metal dichalcogenides family that are of significant interest.
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