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In recent years, realizing new topological phase of matter has been a hottopic in the fields of physics and materials science. Topological semimetalsand metals can conventionally be classified into two types: type-I and type-IIaccording to the tilting degree of the fermion cone. Here, it is the first timeto report a new topological metal phase with the critical-type nodal linebetween type-I and type-II nodal line. The critical-type nodal line shows aunique nontrivial band crossing which is composed of a at band and a dispersiveband and leads to a new fermionic state. We propose intermetallic CaPd can bean existing topological metal for the new fermionic state, characterized withcritical-type nodal line in the bulk and drumhead band structure on thesurface. Our work not only promotes the concept of critical-type nodal line,but also provides the material realization to study its exotic properties infuture experiments.

Topological Phase with Critical-Type Nodal Line State in Intermetallic CaPd