3D Ising Superconductivity in As-Grown Sn Intercalated TaSe₂ Crystal

Area of Science:

• Condensed Matter Physics
• Materials Science

Background:

• 2D Ising superconductivity is observed in noncentrosymmetric 2D materials, distinct from conventional superconductivity.
• Intercalated layered materials offer tunable properties through controlled interlayer spacing.

Purpose of the Study:

• To synthesize and characterize a novel polymorph of intercalated TaSe2 with double-layer Sn intercalation (2Sn-2TaSe2).
• To investigate the superconducting properties and underlying mechanisms of the synthesized 2Sn-2TaSe2 single crystals.

Main Methods:

• Synthesis of 2Sn-2TaSe2 single crystals.
• Transport measurements to analyze conductivity and critical fields.
• Theoretical calculations to understand the role of crystal symmetry and Ising pairing.

Main Results:

• High-quality 2Sn-2TaSe2 single crystals were successfully synthesized.
• The material exhibits 3D Ising superconductivity with an in-plane upper critical field 2.6 times the Pauli limit.
• Conductivity shows characteristics of conventional 3D superconductivity, while Ising pairing persists in 3D.

Conclusions:

• The 2Sn-2TaSe2 material demonstrates a unique combination of 2D Ising pairing within a 3D superconducting state.
• This discovery opens possibilities for exploring dimensional physical behaviors in intercalated layered materials.