Abstract
Recently we reported an enhanced superconductivity in restacked monolayer TaS2 nanosheets compared with the bulk TaS2, pointing to the exotic physical properties of low dimensional systems. Here we tune the superconducting properties of this system with magnetic field along different directions, where a strong Pauli paramagnetic spin-splitting effect is found in this system. Importantly, an unusual enhancement as high as 3.8 times of the upper critical field Bc2, as compered with the Ginzburg-Landau (GL) model and Tinkham model, is observed under the inclined external magnetic field. Moreover, with the out-of-plane field fixed, we find that the superconducting transition temperature Tc can be enhanced by increasing the in-plane field and forms a dome-shaped phase diagram. An extended GL model considering the special microstructure with wrinkles was proposed to describe the results. The restacked crystal structure without inversion center along with the strong spin–orbit coupling may also play an important role for our observations.
Highlights
Superconductivity in low-dimensional systems was investigated extensively recently, due to the fertile physical phenomenon and exotic properties.[1–4] At present, the gate of this research field has just been opened and more interesting phenomena are waiting to be explored
It is found that the critical transition temperature Tc increases with the decrease of thickness and reaches 3.4 K for monolayer TaS2
This value is very close to our sample, confirming the monolayer-features of our sample and suggesting that the restacking process imposed on the monolayer TaS2 does not affect Tc of this system
Summary
Superconductivity in low-dimensional systems was investigated extensively recently, due to the fertile physical phenomenon and exotic properties.[1–4] At present, the gate of this research field has just been opened and more interesting phenomena are waiting to be explored. A clear enhancement of the in-plane upper critical field was frequently reported in these materials, which was interpreted by the Zeeman-protected Ising superconductivity mechanism. We present a detailed investigation on the Abrikosov vortex phase of the above-mentioned superconductor, restacked TaS2 nanosheets, by measuring the conducting properties with magnetic fields along different directions. The in-plane upper critical field Bac2b is clear larger than the Pauli paramagnetic limiting fields BP, indicating a strong Pauli paramagnetic spin-splitting effects in this material. The value of Tc is found to increase with the in-plane field B||ab under a fixed out-of-plane field B||c Both the intrinsic and extrinsic origins for the observations were discussed and we found that the highly noncentrosymmetric crystal structure, the strong spin–orbit coupling, and the special microstructure with wrinkles are important factors for the unusual behaviors we observed
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