Quasi-two-dimensional superconductivity in 1T-Ti_1-xTa_xSe₂

2025/11/01 by Manna, P., Sharma, S., Agarwal, T. +3
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2511.00605

Abstract

The emergence of two-dimensional (2D) superconductivity in bulk transition metal dichalcogenides (TMDs) is a fascinating area of research, as their weak interlayer coupling leads to novel superconducting behavior and offers a rich platform to host nontrivial gap structures and interactions with other electronic orders. In this work, we present a comprehensive study of the superconducting properties of bulk single-crystalline 1T-Ti_1-xTa_xSe₂ for x = 0.2. Our results confirm the weakly coupled anisotropic superconductivity. Angle-dependent upper critical field measurements and observation of a Berezinskii-Kosterlitz-Thouless transition confirm the quasi-2D nature of the superconducting state. These results position 1T-Ti_1-xTa_xSe₂ as a promising platform for exploring low-dimensional superconducting physics and highlight bulk TMD crystals as a promising platform for realizing intrinsic 2D superconductivity, opening avenues for future quantum applications.

Citations

• Ising superconductivity in bulk layered non-centrosymmetric 4H-NbSe2
• Direct evidence for two-gap superconductivity in hydrogen-intercalated titanium diselenide
• Two-dimensional superconductivity in new niobium dichalcogenides-based bulk superlattices
• Two-dimensional superconductivity and anomalous vortex dissipation in newly-discovered transition metal dichalcogenide-based superlattices
• Berezinskii-Kosterlitz-Thouless transition in rhenium nitride films
• Evidence for breathing-type pseudo Jahn-Teller distortions in the charge density wave phase of 1T-TiSe₂
• Two-dimensional superconductivity at (110) LaAlO3/SrTiO3 interfaces
• VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data
• Recent advances in magnetic structure determination by neutron powder diffraction

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• Conventional Type-II Superconductivity in 2H-TaSeS
• The Emergence of Anisotropic Superconductivity in the Nodal-line Semi-metal TlTaSe2