Design of superconducting compounds at lower pressure via intercalating XH4 molecules (X = B, C, and N) into fcc lattices

doi:10.1088/1674-1056/ad7c31

Abstract Recently, many encouraging experimental advances have been achieved in ternary hydrides superconductors under high pressure. However, the extreme pressure required is indeed a challenge for practical application, which promotes a further exploration for high temperature ($T_{\rm c}$) superconductors at relatively low pressure. Herein, we performed a systematic theoretical investigation on a series of ternary hydrides with stoichiometry $AX_2$H$_8$, which is constructed by interacting molecular $X$H$_4$ ($X=$ B, C, and N) into the fcc metal $A$ lattice under low pressure of 0-150 GPa. We uncovered five compounds which are dynamically stable below 100 GPa, e.g., AcB$_2$H$_8$ (25 GPa), LaB$_2$H$_8$ (40 GPa), RbC$_2$H$_8$ (40 GPa), CsC$_2$H$_8$ (60 GPa), and SrC$_2$H$_8$ (65 GPa). Among them, AcB$_2$H$_8$, which is energetically stable above 2.5 GPa, exhibits the highest $T_{\rm c}$ of 32 K at 25 GPa. The superconductivity originates mainly from the coupling between the electron of Ac atoms and the associated low-frequency phonons, distinct from the previous typical hydrides with H-derived superconductivity. Our results shed light on the future exploration of superconductivity among ternary compounds at low pressure.

Keywords: ternary superconductors low pressure $X$H$_4$ molecules fcc lattice

Received: 09 August 2024
Revised: 11 September 2024
Accepted manuscript online: 18 September 2024

PACS:	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)
	74.25.Dw	(Superconductivity phase diagrams)
	74.70.-b	(Superconducting materials other than cuprates)
	74.25.Jb	(Electronic structure (photoemission, etc.))

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12074154, 12174160, and 11722433). Y.L. acknowledges the funding from the Six Talent Peaks Project and 333 High-level Talents Project of Jiangsu Province. Y.Z., S.L., and J.L. acknowledge the Innovation and Entrepreneurship Training Programme for University Students in Jiangsu Province (Grant No. 202210320140Y).

Corresponding Authors: Wenwen Cui, Yinwei Li
E-mail: wenwencui@jsnu.edu.cn;yinwei_li@jsnu.edu.cn

Cite this article:

Yue Zhao(赵玥), Sihan Liu(刘思涵), Jiao Liu(刘骄), Tingting Gu(顾婷婷), Jian Hao(郝健), Jingming Shi(石景明), Wenwen Cui(崔文文), and Yinwei Li(李印威) Design of superconducting compounds at lower pressure via intercalating XH₄ molecules (X = B, C, and N) into fcc lattices 2024 Chin. Phys. B 33 127101

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Design of superconducting compounds at lower pressure via intercalating XH4 molecules (X = B, C, and N) into fcc lattices

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Design of superconducting compounds at lower pressure via intercalating XH₄ molecules (X = B, C, and N) into fcc lattices