Acid etching process for fabrication of Bi2Sr2CaCu2O8+x stack

Abstract

We adopted a new method, acid etching process, to fabricate the intrinsic Josephson junctions based on the Bi 2 Sr 2 CaCu 2 O 8+x single crystals. By soaking the crystals into the dilute hydrochloric acid, we fabricated a junction stack successfully, and meantime made the surrounding area insulated. A certain concentration of hydrochloric acid was used to maintain the roughness of the modified layer. The current-voltage characteristic was achieved through the four terminal measurement. We could control the junctions' number by changing the concentration and the soaking time. We also found that the thickness of the stack was equal to the average height of the insulation layer. Such a simple, convenient and controllable fabrication method with a high yield might widen the applications of the intrinsic Josephson junctions. acid etching process, intrinsic Josephson junction, concentration, four-terminal measurementSince the pioneering work of Kleiner et al. [1] , the intrinsic Josephson junctions (IJJs) have become a hot topic in high temperature superconductivity (HTS), and the technology for fabrication of IJJs has been founded and developed. Conventional method to fabricate a Bi 2 Sr 2 -CaCu 2 O 8+x (BSCCO) stack is argon ion milling. There are several outstanding advantagements, such as fabrication of single IJJ [2] (SIJJ), double-side fabrication method [3] and controllable Bi 2 Sr 2 CaCu 2 O 8+x /Au contacts fabrication [4] . As ion beam etching (IBE) technology is common and successful, it can be used to fabricate IJJs for different purposes. All the aforementioned methods have their own features, but the complicated process with a low output of good samples may restrict the application of IJJs. In this work, we adopted a new process to fabricate the BSCCO stack--acid etching process.

A 23 GHz high-temperature superconducting microstrip filter for radio astronomy

“…The microwave related applications of high-temperature superconducting (HTS) technology have been developed rapidly in recent years [1][2][3][4][5][6][7][8] . The research of the HTS filters is of significant importance due to their great performance [9] .…”

Double-side fabrication process and millimeter wave response of intrinsic Josephson junctions

“…Based on the above facts, we found that the electric characteristic of each junction was uniform, and there was no surface IJJ. Besides that, in this process thick single crystal substrate was eliminated, and thereby the heat generated from measurements could be diffused in time, so that there is no back bending phenomenon caused by heating effect on the quasiparticle branch of the I-V curves [8] . Figure 4 shows the experiment system for measuring the millimeter wave response of IJJs.…”