Quasi-two-dimensional superconductivity in SnSe2 via organic ion intercalation

In this work, two organic-ion-intercalated SnSe2 superconductors, (TBA)(x)SnSe2 (T-c similar to 6.4 K) and (CTA)(x)SnSe2 (T-c similar to 7.1 K), are synthesized by an electrochemical intercalation method. Via the intercalation of organic ions, the interlayer distance is dramatically enlarged from 6.12 angstrom of pristine SnSe2 to 18.62 and 14.74 angstrom for (TBA)(x)SnSe2 and (CTA)(x)SnSe2, respectively. Bulk magnetic susceptibility measurements suggest that both superconductors exhibit a strong anisotropic superconducting shielding effect below T-c. Further measurements of resistivity, I-V characteristic curves, and magnetoresistance reveal a quasi-two-dimensional (2D) superconductivity in (CTA)(x)SnSe2. The present work suggests that the organic-ion-intercalation method can induce quasi-2D superconductivity in SnSe(2)layers and provides a simple and practical strategy to explore 2D superconductivity as well as other 2D phenomena in layered materials.