Abstract
Superconducting properties of Cr0.0005NbSe2 (Tc~6.64 K) single crystals have been investigated through the temperature dependent resistivity (~8 GPa) and DC magnetization (~1 GPa) measurements. Further, the critical current density (Jc) as a function of applied magnetic field has been studied from magnetic isotherms. The vortex pinning mechanisms have also been systematically analyzed using weak collective pinning theory as a function of pressure. The Jc corresponds to the flux flow enhanced by the application of pressure due to increase of Tc and vortex changes. We found that the pressure is responsible for the spatial variations in the charge carrier mean free path (δl pinning). We find that core point pinning is more dominant than surface pinning which is caused by the application of pressure. In addition, Jc(H = 0) increases from 3.9 × 105 (0 GPa) to 1.3 × 106 (1.02 GPa) A/cm2 at 2 K as the pressure is increased from normal pressure to 1.02 GPa. The pressure dependence of Tc (dTc/dP) becomes 0.91 K/GPa and 0.75 K/GPa from magnetization and resistivity measurements respectively. We found that the pressure promotes the anisotropy nature, and decrease of coherence length and resulting in pathetic interface of the vortex core with pinning centers.
Highlights
Superconductivity in the transition metal dichalcogenides (TMDs) and their intercalated layered structure compounds have special features associated with extreme anisotropy of the superconducting materials[1]
The vortex movement is possibly pinned at the edges when applied very low magnetic field which can be generally attributed to the translational symmetry breaking at the edges and it is dependent on both shape and dimension of the superconductors[13,16]
We have shown that hydrostatic pressure is a very effective means to significantly enhance Tc, Jc, Hirr, and flux pinning in the Cr0.0005NbSe2 superconductor
Summary
Received: 5 June 2018 Accepted: 25 November 2018 Published: xx xx xxxx mechanism on Cr0.0005NbSe2 single crystal under Hydrostatic pressure. In the weakly pinned superconductors, interplay between intervortex interface and flux pinning produces an unusual peak in Jc as a function of both field and temperature which are just below the normal-state boundary and it is usually designated as secondary peak effect[17,18] Both strong pinning and high Jc depend on variation in the grain size and the coherence length (ξ)[19]. We anticipated that hydrostatic pressure would increase the superconducting volume, Hirr, and Hc2 due to enhancement of Tc, increase the point defect and reduction in the anisotropy of single crystalline Cr intercalated NbSe2 samples We observed such interesting properties when pressure was applied to Cr intercalated NbSe2 is investigated.
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