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Nodal line semimetals (NLSs) have attracted broad interest in currentresearch. In most of existing NLSs, the intrinsic properties of nodal lines aregreatly destroyed because nodal lines usually suffer sizable gaps induced bynon-negligible spin-orbit coupling (SOC). In this work,we propose thetopological nodal line electrides (TNLEs), which achieve electronic structuresof nodal lines and electrides simultaneously, provide new insight on designingexcellent NLSs nearly immune from SOC. Since the states near the Fermi levelare most contributed by nonnucleus-bounded interstitial electrons, nodal linesin TNLEs manifest extremely small SOCinduced gap even possessing heavyelements. Especially, we propose the family of A2B (A = Ca, Sr, Ba; B= As, Sb,Bi) materials are realistic TNLEs with negligible SOC-induced gaps, which canplay as excellent platforms to study the intrinsic properties of TNLEs

Topological Nodal Line Electrides: Realization of Ideal Nodal Line State Nearly Immune from Spin-Orbit Coupling