Bi-$_{2}$-Sr-$_{2}$-CaCu-$_{2}$-O-$_{8+δ}$微米薄环的磁化及其退钉线
Magnetization of Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ micrometer thin ring and its depinning line
摘要：
我们证明了几何效应对Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8+δ}$高温$_c$超导体（HTSC）微米环磁通线晶格的退钉扎线（DL）的影响。与相同样品的块状晶体和薄片相比，DL转移到明显更低的温度。这种变化是由于双尺寸效应导致的整体钉扎电位的降低，即：a）环厚度$\sim 1~μ$ m小于钉扎相关长度，以及b）涡旋（Pearl涡旋）的有效伦敦穿透深度的增加。DL向较低温度的大偏移可能会影响这种HTSC在微带天线和THz发射器中应用的适用性。
英文摘要：
We demonstrate a geometrical effect on the depinning line (DL) of the flux line lattice of the Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+δ}$ 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 $\sim 1~μ$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.
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