Electronic structure of superconducting Ta₄Pd₃Te₁₆

The electronic structure of Ta₄Pd₃Te₁₆ was analyzed by tight-binding band calculations based on the given structure. The compound electronically showed quasi-one-dimensional behavior even though it comprised a two-dimensional layered structure. A strong orbital interaction was found only along the crystallographic b-direction of the compound. Fermi surface nesting disappeared in Ta₄Pd₃Te₁₆ because of the weak interaction between Ta-Te and Pd-Te polyhedra. It was found, therefore, that this compound could be a superconductor through suppression of the charge-density wave state via disappearance of Fermi surface nesting.