Researchers have unveiled a unified understanding of superconductivity in transition-metal dichalcogenides (TMDs), highlighting the interplay between charge density wave (CDW) strength and superconducting properties. This study focuses on TaS₂, revealing that its critical temperature ((T_c)) and upper critical field ((H_{c2})) are strongly influenced by thickness, with thinner layers showing enhanced superconductivity. Unlike Nb-based TMDs, which exhibit reduced (T_c) with decreasing thickness, Ta-based TMDs demonstrate an increase, attributed to CDW interactions. The findings suggest a common mechanism across TMDs, with (H_{c2}) scaling quadratically with (T_c), governed by CDW strength. This insight advances the design of tunable superconducting materials and deepens the understanding of CDW-superconductivity interplay.
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https://www.nature.com/articles/s41467-024-54517-2
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