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

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

doi:10.7566/JPSJ.93.124709

paper

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

arXiv:2408.17033 · doi:10.7566/JPSJ.93.124709

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 ( $I 4_{1} / am d$ , $D_{4 h}^{19}$ , \#141) and non-centrosymmetric tetragonal ( $I 4_{1} m d$ , $C_{4 v}^{11}$ , \#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 $T_{c}$ 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 ( $P 6/ mmm$ , $D_{6 h}^{1}$ , \#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 $T_{c} = 0.38$ K. This system provides an opportunity to investigate the relationship between topological electronic states, SC, and disorders

Structural Evolution from Hyper-Honeycomb to Honeycomb Networks and Superconductivity in LaPtx​Si2−x​

Abstract

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