2014/12/16 by Babar Shabbir, Xiaolin Wang, Shaban Reza Ghorbani +4
Materials Science · Physics and Astronomy · #Ambient pressure #Anisotropy #Coherence length #Condensed matter physics #Critical current #Hydrostatic equilibrium #Hydrostatic pressure #Iron-based superconductors research #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Pinning force #Superconductivity #Superconductivity in MgB2 and Alloys #Thermodynamics #Vortex #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/28/5/055001
published as 2015 Supercond. Sci. Technol. 28 055001
arxiv created 2014/12/16 · openalex publication_date 2015/03/13 · arxiv updated 2015/03/17 · openalex created_date 2017/06/30 · openalex updated_date 2026/08/05
The impact of hydrostatic pressure up to 1.2 GPa on the critical current density ( J c ) and the nature of the pinning mechanism in MgB 2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can induce a transition from the regime where pinning is controlled by spatial variation in the critical transition temperature ( δ T c ) to the regime controlled by spatial variation in the mean free path ( δ ℓ ) . Furthermore, critical temperature ( T c ) and low field J c are slightly reduced, although the J c drops more quickly at high fields than at ambient pressure. We found that the pressure raises the anisotropy and reduces the coherence length, resulting in weak interaction of the vortex cores with the pinning centres. Moreover, the hydrostatic pressure can reduce the density of states [ N s ( E )], which, in turn, leads to a reduction in the T c from 39.7 K at P = 0 GPa to 37.7 K at P = 1.2 GPa.