Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 64: BKT Physics
TT 64.3: Talk
Wednesday, March 11, 2026, 17:15–17:30, HSZ/0103
Quasi-two-dimensional superconductivity in 1T-Ti1−xTaxSe2 — •Poulami Manna, Suhani Sharma, Tarushi Agarwal, Shashank Srivastava, Priya Mishra, and Ravi Prakash Singh — Indian Institute of Science Education and Research, Bhopal
The emergence of two-dimensional (2D) superconductivity in bulk transition metal dichalcogenides (TMDs) has sparked crucial research interest for hosting exotic quantum states. Intercalation, doping, or inserting insulating layers can significantly weaken the interlayer coupling, thereby achieving 2D behavior in bulk materials. While doped bulk crystals of TaS2 and NbSe2 show 2D superconductivity, Ti-based TMDs remain largely unexplored. Among them, non-superconducting TiSe2 has been extensively studied due to its controversial electronic nature and semimetallic/semiconducting behavior.
Here, we discuss the superconducting properties of single-crystalline 1T-Ti1−xTaxSe2 for x = 0.2, using magnetization, resistivity, and specific heat measurements. The results reveal anisotropic bulk superconductivity with a transition temperature of 2.32(1) K. Specific heat measurements show weakly coupled, isotropic s-wave superconductivity in Ti0.8Ta0.2Se2. Notably, the first evidence of quasi-2D superconductivity in Ti-based TMD is confirmed by angle-dependent magneto-transport measurements and observation of a BKT transition. These findings offer an opportunity to explore numerous low-dimensional quantum phases in bulk materials and effectively broaden the new pathway for realizing 2D superconductivity.
Keywords: Superconductivity; Layered material; Transition metal dichalcogenides; Two-dimensional superconductivity; Type-II superconductors