LaPt$_x$Si$_{2-x}$中从超蜂窝到蜂窝网络的结构演变及超导性
Structural Evolution from Hyper-Honeycomb to Honeycomb Networks and Superconductivity in LaPt$_x$Si$_{2-x}$
AI总结：
研究LaPtₓSi₂₋ₓ（0.5≤x≤1.0）的晶体结构演变与超导性，发现x≥0.86时保留非中心对称四方结构及部分无序，x降低至0.5时转变为六方相，为拓扑电子态与超导关联研究提供体系。
摘要：
我们报道了LaPt$_{x}$Si$_{2-x}$（0.5≤x≤1.0）的晶体结构与超导性（SC），该体系是具有中心对称四方结构（I4₁/amd，D₄h¹⁹，#141）的LaSi₂和非中心对称四方结构（I4₁md，C₄v¹¹，#109）的LaPtSi的固溶体。研究发现，当0.86≤x≤1.00时，非中心对称四方对称性得以保留，但超蜂窝网络中交替的Pt和Si出现部分无序；随着x从1.0降至0.86，超导转变温度Tₙ从3.9 K急剧降至1.5 K。此外，在0.50≤x≤0.71区间发现了具有AlB₂型结构（P6/mmm，D₆h¹，#191）的六方相，其Pt和Si原子呈统计分布的蜂窝网络，并在Tₙ=0.38 K时表现出超导性。该体系为研究拓扑电子态、超导性与无序之间的关系提供了机会。
英文摘要：
We report the crystal structures and superconductivity (SC) of LaPt$_{x}$Si$_{2-x}$ ($0.5 \leq x \leq 1.0$) that are solid solutions of LaSi$_{2}$ and LaPtSi with centrosymmetric tetragonal ($I4_{1}/amd$, $D_{4h}^{19}$, \#141) and non-centrosymmetric tetragonal ($I4_{1}md$, $C_{4v}^{11}$, \#109) structures, respectively. It was found that at $0.86 \leq x \leq 1.00$, the non-centrosymmetric tetragonal symmetry is preserved, while partial disorder appears in alternating Pt and Si of the hyper-honeycomb network. The superconducting transition temperature $T_{\rm c}$ was drastically reduced from 3.9 K to 1.5 K as $x$ varies from 1.0 to 0.86. Additionally, a hexagonal phase with an AlB$_{2}$-type structure ($P6/mmm$, $D_{6h}^{1}$, \#191) has been discovered at $0.50 \leq x \leq 0.71$ with a honeycomb network of statistically distributed Pt and Si atoms. The hexagonal phase exhibited SC at $T_{\rm c} = 0.38$ K. This system provides an opportunity to investigate the relationship between topological electronic states, SC, and disorders
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