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We report a combined experimental and theoretical study of the PdSe2-xTexsystem. With increasing Te fraction, structural evolutions, first from anorthorhombic phase (space group Pbca) to a monoclinic phase (space group C2/c)and then to a trigonal phase (space group P-3m1), are observed accompanied withclearly distinct electrical transport behavior. The monoclinic phase (C2/c) isa completely new polymorphic phase and is discovered within a narrow range ofTe composition (0.3 \leq x \leq 0.8). This phase has a different packingsequence from all known transition metal dichalcogenides to date. Electroniccalculations and detailed transport analysis of the new polymorphicPdSe1.3Te0.7 phase are presented. In the trigonal phase region,superconductivity with enhanced critical temperature is also observed within anarrow range of Te content (1.0 \leq x \leq 1.2). The rich phase diagram, newpolymorphic structure as well as abnormally enhanced superconductivity couldfurther stimulate more interest to explore new types of polymorphs andinvestigate their transport and electronic properties in the transition metaldichalcogenides family that are of significant interest.

New polymorphic phase and rich phase diagram in the PdSe2-xTex system