English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Isothermal magnetic field dependence of magnetization and the magneticrelaxation measurements were performed for $H$$\parallel$c axis on singlecrystal of Ba(Fe$_{0.935}$Co$_{0.065}$)$_2$As$_2$ pnictide superconductorhaving $T_c$ = 21.7 K. The second magnetization peak (SMP) for each isothermal$M(H)$ was observed in a wide temperature range from $T_c$ to the lowesttemperature of measurement (2 K). Magnetic field dependence of relaxation rate$R(H)$, shows a peak (H$_{spt}$) between H$_{on}$ (onset of SMP in $M(H)$) andH$_p$ (peak field of SMP in $M(H)$), which is likely to be related with avortex-lattice structural phase transition, as suggested in literature forsimilar sample. In addition, the magnetic relaxation measured for magneticfields near H$_{spt}$ show some noise which might be the signature of thestructural phase transition of the vortex lattice. Analysis of the magneticrelaxation data using Maley's criterion and the collective pinning theorysuggests that the second magnetization peak (SMP) in the sample is due to thecollective (elastic) to plastic creep crossover, which is also accompanied witha rhombic to square vortex lattice phase transition. Analysis of the pinningforce density suggests single dominating pinning mechanism in the sample and isnot showing the usual $\delta$l and $\delta T_c$ nature of pinning. Thecritical current density ($J_c$) estimated using the Bean's critical statemodel is found to be 5 $\times$ 10$^5$ A/cm$^2$ at 2 K in the zero magneticfield limit. Surprisingly, the maximum in the pinning force density is notresponsible for the maximum value of the critical current density in thesample.

Study of the second magnetization peak and the pinning behaviour in Ba(Fe$_{0.935}$Co$_{0.065}$)$_2$As$_2