Researchers from the High Magnetic Field Laboratory of the Hefei Institutes of Physical Science of the Chinese Academy of Sciences, alongside colleagues from Shandong University and Anhui University, have observed a unique superconducting state in layered 1T-TaS₂ material by using organic molecules to stabilize the crystals under extreme pressure. Unlike the original material, superconductivity in the intercalated sample appeared only after suppressing an electronic state at pressures significantly higher than previously required.

“Our findings show how changing the interactions between atomic layers can change a material’s quantum behavior,” said Prof. YANG Zhaorong, adding that the work also offers a new way to explore unusual forms of superconductivity. The team’s results reveal the material exhibits strong Ising characteristics, exceeding the conventional Pauli limit by a factor of two within the plane of the material.

Organic Intercalation Stabilizes 1T-TaS₂ Under Extreme Pressure

Organic intercalation enabled sustained study of 1T-TaS₂ crystals under pressures that would normally destroy them, a technique allowing researchers to observe the material’s behavior as if it were significantly thinner. This approach involved inserting an organic molecule between the layers of the crystals, effectively weakening the atomic interactions and bolstering stability during compression.

Comparing this modified material to standard 1T-TaS₂ revealed divergent pathways to achieving superconductivity, a state of zero electrical resistance. The team’s work, published in Reports on Progress in Physics, demonstrates that manipulating interlayer interactions can dramatically alter a material’s quantum properties and may allow exploration of previously inaccessible superconducting phases.