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

L. K. Ma; M. Z. Shi; B. L. Kang; K. L. Peng; F. B. Meng; C. S. Zhu; J. H. Cui; Z. L. Sun; D. H. Ma; H. H. Wang; B. Lei; T. Wu; X. H. Chen

doi:10.1103/PhysRevMaterials.4.124803

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

L. K. Ma, M. Z. Shi, B. L. Kang, K. L. Peng, F. B. Meng, C. S. Zhu, J. H. Cui, Z. L. Sun, D. H. Ma, H. H. Wang, B. Lei, T. Wu, X. H. Chen

DOI 10.1103/PhysRevMaterials.4.124803 · Physical Review Materials

T1

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Abstract

In this work, two organic-ion-intercalated SnSe2 superconductors, (TBA)xSnSe2 (Tc∼6.4K) and (CTA)xSnSe2 (Tc∼7.1K), are synthesized by an electrochemical intercalation method. Via the intercalation of organic ions, the interlayer distance is dramatically enlarged from 6.12 Å of pristine SnSe2 to 18.62 and 14.74 Å for (TBA)xSnSe2 and (CTA)xSnSe2, respectively. Bulk magnetic susceptibility measurements suggest that both superconductors exhibit a strong anisotropic superconducting shielding effect below Tc. Further measurements of resistivity, I-V characteristic curves, and magnetoresistance reveal a quasi-two-dimensional (2D) superconductivity in (CTA)xSnSe2. The present work suggests that the organic-ion-intercalation method can induce quasi-2D superconductivity in SnSe2 layers and provides a simple and practical strategy to explore 2D superconductivity as well as other 2D phenomena in layered materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(TBA)xSnSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.4	Pressure not reported	onset
(CTA)xSnSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.1	Pressure not reported	onset
(CTA)0.5SnSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.46	Pressure not reported	onset
(CTA)0.5SnSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.75	Pressure not reported	zero_resistance