Enhancement of superconducting properties and flux pinning mechanism on Cr_0.0005NbSe₂ single crystal under Hydrostatic pressure.

Content Provider	Europe PMC
Author	Arumugam, S. Krishnan, Manikandan Ishigaki, Kent Gouchi, Jun Pervin, Rukshana Selvan, G. Kalai Shirage, Parasharam M. Uwatoko, Y.
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.
Journal	Scientific Reports [Sci Rep]
Volume Number	9
DOI	10.1038/s41598-018-36672-x
PubMed Central reference number	PMC6344477
Issue Number	1
PubMed reference number	30674929
e-ISSN	20452322
Language	English
Publisher	Nature Publishing Group
Publisher Date	2019-01-23
Publisher Place	London
Access Restriction	Open
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary