Molecule-Confined Engineering toward Superconductivity and Ferromagnetism in Two-Dimensional Superlattice

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Superconductivity and ferromagnetism are typically mutually exclusive due to destructive exchange fields.
• Achieving coexistence often requires inherent superconducting and ferromagnetic materials within a single structure.
• Freestanding coexistence in non-superconducting and non-ferromagnetic components remains a significant challenge.

Purpose of the Study:

• To demonstrate freestanding coexistence of superconductivity and ferromagnetism in a novel material system.
• To explore molecule-confined engineering for creating exotic electronic properties.
• To investigate the underlying electronic interactions responsible for the coexisting phenomena.

Main Methods:

• Utilizing a chemical building-block approach to create a two-dimensional organic-inorganic superlattice.
• Employing molecule-confined engineering within SnSe2 interlayers.
• Analyzing electronic interactions and spatial confinement effects on molecular behavior.

Main Results:

• Successfully realized the first freestanding coexistence of superconductivity and ferromagnetism from non-superconducting and non-ferromagnetic building blocks.
• Demonstrated that confined Co(Cp)2 molecules exhibit ferromagnetism due to weakened coordination fields.
• Observed induced superconductivity via electron transfer from molecules to the SnSe2 lattice.

Conclusions:

• Molecule-confined engineering in 2D superlattices is a viable strategy for achieving coexisting superconductivity and ferromagnetism.
• This new class of material exhibits a unique correlated state with Kondo effect between molecular ferromagnetic and inorganic superconducting layers.
• Confined molecular chemistry offers a powerful new avenue for discovering exotic properties in 2D materials.