TaS₁.₉₉Se₀.₀₁ (4Hb phase, Se-doped TaS₂)

TaS_1.99Se_0.01 (4Hb phase) is a lightly selenium-doped 4Hb-polytype tantalum disulfide: a metal and superconductor with T_c ~ 2.8 K. The 4Hb polytype naturally combines 1T and 1H layers, and dilute Se substitution fine-tunes its charge-density-wave and superconducting states.

Growth method: Chemical vapor transport (CVT).

Specifications: Plate-like crystals, approximately 2 mm × 2 mm × 0.05 mm (l × w × t). Multiple pieces per pack.

Exfoliation difficulty: Moderate (van der Waals layered crystal).