  Inorganic electrides are a new class of compounds catering to the interest of
scientists due to the multiple usages exhibited by interstitial electrons in
the lattice. However, the influence of the shape and distribution of
interstitial electrons on physical properties and new forms of physical states
are still unknown. In this work, crystal structure search algorithms are
employed to explore the possibility of forming new electrides in the As-Li
system, where interstitial electrons behave as 1D electron chains (1D
electride) in Pmmm phase of AsLi$_7$ and transform into 0D electron clusters
(0D electride) in P6/mmm phase at 80 GPa. The P6/mmm phase has relatively high
superconductivity at 150 GPa (Tc=38.4K) than classical electrides, even at
moderate pressure with Tc=16.6K. The novel superconducting properties are
conjectured to be possibly due to three Van Hove singularities at the Fermi
level. In addition, a Dirac cone in the band has been observed, expanding the
sources of Dirac materials. The survival of AsLi$_7$ at room temperature is
confirmed by molecular dynamics simulation at 300 K. At 1000 K, the As atoms in
the system act like solid, while a portion of the Li atoms cycle around the As
atoms, and another portion of the Li atoms flow freely like liquid, showing the
novel physical phenomenon of the coexistence of the plastic and superionic
states. This suggests that the superionic and plastic states cannot only be
found in hydrides but also in the electride. Our results indicate that
superconducting electride AsLi$_7$ with superionic and plastic states can exist
in Earth's interior.
