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Ba3Al2As4 exhibits an unusual anisotropic electrical conductivity, that is,the electrical conductivity along the chain is smaller than those along othertwo directions which conflicts previous conclusion. Earlier studies on Ca5M2Pn6showed a high electrical conductivity along the chain. The band decomposedcharge density is used to explain such unusual behavior. The results indicatethat the existence of a conductive pathway near the Fermi level is responsiblefor the electrons transport. Further, the Ba-As bonding of Ba3Al2As4 is somedegree covalency which is novel for the Zintl compounds.

The origin of the unusual anisotropic electrical conductivity of Ba3Al2As4