Two-dimensional superconductivity in new niobium dichalcogenides-based bulk superlattices
Kaibao Fan, Mengzhu Shi, Houpu Li, Ziji Xiang, Xianhui Chen
DOI 10.1103/PhysRevMaterials.9.034804 · Physical Review Materials
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Abstract
Transition metal dichalcogenides exhibit many unexpected properties including two-dimensional (2D) superconductivity as the interlayer coupling being weakened upon either layer-number reduction or chemical intercalation. Here, we report the realization of 2D superconductivity in the newly synthesized niobium dichalcogenides-based bulk superlattices Ba0.75ClNbS2 and Ba0.75ClNbSe2, which consist of the alternating stacking of monolayer H−NbS2 (or H−NbSe2) and monolayer inorganic insulator spacer Ba0.75Cl. Magnetic susceptibility and resistivity measurements show that both superlattices belong to type-II superconductor with Tc of 1 K and 1.25 K, respectively. Intrinsic 2D superconductivity is confirmed for both compounds below a Berezinskii-Kosterlitz-Thouless transition and a large anisotropy of the upper critical field. Furthermore, the upper critical field along ab plane (Hc2∥ab) exceeds the Pauli limit (μ0Hp) in Ba0.75ClNbSe2, highlighting the influence of spin-orbit interactions. Our results establish a generic method for realizing the 2D superconducting properties in bulk superlattice materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.75ClNbS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | zero_resistance |
| Ba0.75ClNbS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | onset |
| Ba0.75ClNbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.25 | Pressure not reported | zero_resistance |
| Ba0.75ClNbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.25 | Pressure not reported | onset |
| NbS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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