1998 journal article

Isolation techniques and electrical characterization of single grain boundaries of Bi2Sr2CaCu2O2 high-temperature superconductor

PHYSICA C, 295(3-4), 225–234.

By: A. Saleh, G. Schindler n, C. Sarma n, D. Haase n, C. Koch n & A. Kingon n

co-author countries: United States of America 🇺🇸
Source: Web Of Science
Added: August 6, 2018

We have isolated single grain boundaries of a bulk material of polycrystalline high-temperature superconductor Bi2Sr2CaCu2O2 (Bi-2212) tapes. The tapes were grown on a single crystal of MgO or Ag-foil by partial melting of the superconductor. The isolation techniques consisted of fabricating metal micro-contact pads, wire bonding, and laser patterning of the Bi-2212 superconductor. Results of electrical and magnetic measurements of single grain boundaries suggested a possible existence of Josephson-like junctions coexisting with flux flow junctions. In contrast to bulk samples, Tc of a single grain boundary did not change by applying magnetic field. Jc and Tc were found to be greatly dependent on heat treatment and growth conditions. The current–voltage characteristics of a single patterned bridge followed a relation of the form V∼(I−Ic)n for I>Ic with n∼1.2.