2H-NbSe₂ (Niobium Diselenide, 2H phase)

2H-NbSe₂ is a 2H-phase layered transition-metal dichalcogenide, metallic, exhibiting both superconductivity (transition temperature 7.2 K (confirmed by ZFC/FC magnetization measurements)) and a charge-density wave (≈ 33 K). It is a classic material for studying two-dimensional superconductivity and its coexistence/competition with a CDW; superconductivity persists down to the monolayer and, owing to Ising pairing, shows a very high in-plane critical field. Its layered structure is readily exfoliable and is also used in van der Waals superconducting heterostructures.

Growth method: Chemical vapor transport (CVT).

Sample specifications: Individual crystals measure approximately 3 mm, with a purity of up to 99.9999% (6N), and multiple high-quality single-crystal pieces included in each package.

Exfoliation: Easy — readily cleaved into thin flakes by standard mechanical exfoliation.