arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2201.00130cond-mat.supr-con
收藏

高压下S-P-H三元氢化物的结构多样性和超导电性

Structural Diversity and Superconductivity in S-P-H Ternary Hydrides Under Pressure

Nisha Geng, Tiange Bi, Eva Zurek

摘要:

演化结构搜索揭示了压力下的S-P-H三元相图中存在大量的稳定相和低焓亚稳相。发现了各种各样的晶体结构类型,包括具有一维链、基于S-H或S-P-H正方形晶格的二维片以及S-H或P-H蜂窝和笼状结构的晶体结构。一些笼状结构可以通过用磷掺杂高压高温超导$Im\bar{3}m$ H $_3$ S相来获得。大多数发现的化合物是金属的,但是那些来自$Im\bar{3}m$ H $_3$ S晶格与低水平的P-掺杂被预测具有最高的超导临界温度($T_c$ s)。磷呈现八面体配位的倾向以及硫和磷的相似半径是在$Im\bar{3}m$ S $_{0.875}$ P $_{0.125}$ H $_3$中保持费米能级处的高态密度的关键,估计其$T_c$与H $_3$ S在200 GPa下的态密度相似。

英文摘要:

Evolutionary structure searches revealed a plethora of stable and low-enthalpy metastable phases in the S-P-H ternary phase diagram under pressure. A wide variety of crystalline structure types were uncovered ranging from those possessing one-dimensional chains, two-dimensional sheets based on S-H or S-P-H square lattices as well as S-H or P-H honeycombs, and cage-like structures. Some of the cage-like structures could be derived from doping the high-pressure high-temperature superconducting $Im\bar{3}m$ H$_3$S phase with phosphorous. Most of the discovered compounds were metallic, however those derived from $Im\bar{3}m$ H$_3$S lattices with low levels of P-doping were predicted to possess the highest superconducting critical temperatures ($T_c$s). The propensity for phosphorous to assume octahedral coordination, as well as the similar radii of sulfur and phosphorous are key to maintaining a high density of states at the Fermi level in $Im\bar{3}m$ S$_{0.875}$P$_{0.125}$H$_3$, whose $T_c$ was estimated to be similar to that of H$_3$S at 200~GPa.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑