Structural Evolution from Hyper-Honeycomb to Honeycomb Networks and Superconductivity in LaPt$_x$Si$_{2-x}$

arXiv - PHYS - Superconductivity Pub Date : 2024-08-30 DOI:arxiv-2408.17033

Sitaram Ramakrishnan, Tatsuya Yamakawa, Ryohei Oishi, Soichiro Yamane, Atsutoshi Ikeda, Masaki Kado, Yasuyuki Shimura, Toshiro Takabatake, Takahiro Onimaru, Yasuhiro Shibata, Arumugam Thamizhavel, Srinivasan Ramakrishnan, Shingo Yonezawa, Minoru Nohara

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Abstract

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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LaPt$_x$Si$_{2-x}$ 中从超蜂窝到蜂窝网络的结构演变和超导性

我们报告了LaPt$_{x}$Si$_{2-x}$（$0.5 \leq x \leq 1.0$）的固溶体，它们分别是具有中心对称四方（$I4_{1}/amd$,$D_{4h}^{19}$, \#141）和非中心对称四方（$I4_{1}md$,$C_{4v}^{11}$, \#109）结构的LaSi$_{2}$和LaPtSi。研究发现，在 $0.86 \leqx \leq 1.00$ 时，非中心对称的四方对称性得以保留，而在超蜂蜜网络的铂和硅交替中出现了部分无序。当 x$ 从 1.0 变化到 0.86 时，超导转变温度 $T_{\rm c}$ 从 3.9 K 急剧下降到 1.5 K。此外，在0.50 \leq x \leq 0.71$处发现了具有AlB$_{2}$型结构（$P6/mmm$, $D_{6h}^{1}$,\#191）的六边形相，其铂原子和硅原子呈蜂窝状分布。该体系为研究拓扑电子态、SC 和紊乱之间的关系提供了一个机会。

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arXiv - PHYS - Superconductivity

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