Electronic structure of Yb₄As₃

Two kinds of substituted systems, Yb₄(As_1-xSe _x)₃ and Yb₄(As_1-xSb _x)₃, were investigated to clarify the electronic structure of Yb₄As₃. By the comparison of the magnetic and transport properties of these systems, it is revealed that the Se-substitution causes the decrease of the Yb³⁺ ions, while the Sb-substitution causes the increase of the holes and the decrease of the Yb³⁺ ions simultaneously. These results indicate that the number of the holes on the valence p-band almost corresponds to the number of the Yb²⁺ ions on the one-dimensional magnetic chains in Yb₄As₃. This scenario could explain many physical properties of the substituted and non-doped Yb₄As₃.