Magnetization of Bi2Sr2CaCu2O8+δ 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+δ high-T c superconductor (HTSC) micrometer ring. The DL shifts to notably lower temperatures in comparison with 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 ∼ 1 μm 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. Keywords BSCCO • Depinning line • Microstrip antenna • Vortex dynamics • THz emitter 1 Introduction Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212) is a high-T c superconductor (HTSC), whose magnetic and superconducting properties are still being investigated [1-9]. In particular, Bi-2212 single crystals are considered to be a key element for THz emitter devices in modern electronics [9-12]. Recently, numerical simulations and analytical calculations classified Bi-2212 micrometer rings as a class of low-loss subwavelength resonators for microstrip antennas and THz B. Semenenko

The Investigation of Bi-Ga Partial Replacement Effect on Magnetic, Mechanical and Microstructural Properties Bi(1,8-x)Pb0,2GaxSr2CaCu2Oy Superconductor

“…Burada, FGa0 numunesinin süperiletkenliğe geçişinin 85 K'de başladığı görülmektedir. Bu, Bi-2212 fazı için literatüre uyumlu bir kritik sıcaklık değeridir [28,29]. SEM sonuçları ile birlikte değerlendirildiğinde, Bi1,8Pb0,2Sr2CaCu2Oy formülüne göre elde edilen katkısız malzemede amorf yapılar bulunmasına rağmen, malzeme genel olarak ideal bir Bi-2212 fazı olarak değerlendirilebilir.…”