首页|Design of superconducting compounds at lower pressure via intercalating XH4 molecules(X=B,C,and N)into fcc lattices
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
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(Tc)superconductors at relatively low pressure.Herein,we performed a systematic theoretical investigation on a series of ternary hydrides with stoichiometry AX2H8,which is constructed by interacting molecular XH4(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.,AcB2H8(25 GPa),LaB2H8(40 GPa),RbC2H8(40 GPa),CsC2H8(60 GPa),and SrC2H8(65 GPa).Among them,AcB2H8,which is energetically stable above 2.5 GPa,exhibits the highest Tc 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.
Laboratory of Quantum Functional Materials Design and Application,School of Physics and Electronic Engineering,Jiangsu Normal University,Xuzhou 221116,China
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