Magnetization of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ micrometer thin ring and its depinning line

Abstract

We demonstrate a geometrical effect on the depinning line (DL) of the flux line lattice of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ high-T${}_c$ superconductor (HTSC) micrometer ring. The DL shifts to notably lower temperatures in comparison to bulk crystals and thin flakes of the same sample. The shift is attributed to a decrease in the overall pinning potential due to a double size effect, namely: a) the ring thickness $\sim 1\mu$m being smaller than the pinning correlation length, and b) the increase in the effective London penetration depth of the vortices (Pearl vortices). The large shift of the DL to lower temperatures may influence the suitability of this HTSC for applications in microstrip antennas and THz emitters.

arXiv commentReviewed, AAM. 13 pages, 10 figures

References in corpus (5)

• Highly crystalline 2D superconductors
• Magnetic response of mesoscopic superconducting rings with two order parameters
• Electric-Field Induced Superconductor-Insulator Transitions in Exfoliated Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Flakes
• Finite-size effect of critical penetration of Pearl vortices in narrow superconducting flat rings
• Nonlinear ac susceptibility studies of high-$T_c$ rings: Influence of the structuring method and determination of the flux creep exponent

Cited by in corpus (1)

• Strong non-linear response of strange metals