Thick Bi2Sr2CaCu2O8+δ films grown by liquid-phase epitaxy for Josephson THz applications. (27th November 2017)

• Record Type: Journal Article
• Authors: Simsek, Y; Vlasko-Vlasov, V; Koshelev, A E; Benseman, T; Hao, Y; Kesgin, I; Claus, H; Pearson, J; Kwok, W-K; Welp, U
• Is Part Of: Superconductor science & technology. Volume 31:Number 1(2018:Jan.)
• Publication Date: 2017-11-27
• Subjects: intrinsic Josephson junctions -- liquid-phase epitaxy -- Bi-2212 high-Tc superconducting films; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aa987e
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Theoretical and experimental studies of intrinsic Josephson junctions (IJJs) that naturally occur in high- T c superconducting Bi2 Sr2 CaCu2 O8+ δ (Bi-2212) have demonstrated their potential for novel types of compact devices for the generation and sensing of electromagnetic radiation in the THz range. Here, we show that the THz-on-a-chip concept may be realized in liquid-phase epitaxial-grown (LPE) thick Bi-2212 films. We have grown μ m thick Bi-2212 LPE films on MgO substrates. These films display excellent c -axis alignment and single crystal grains of about 650 × 150 μ m 2 in size. A branched current–voltage characteristic was clearly observed in c -axis transport, which is a clear signature of underdamped IJJs, and a prerequisite for THz-generation. We discuss LPE growth conditions allowing improvement of the structural quality and superconducting properties of Bi-2212 films for THz applications.