Measurement of current voltage characteristics of single grain boundaries in melt textured bulk YBa[sub 2]Cu[sub 3]O[sub [ital x]]

• Published in: Applied physics letters Vol. 64:1
• Main Authors: Sarma, C., Schindler, G., Haase, D.G., Koch, C.C., Saleh, A.M., Kingon, A.I.
• Format: Journal Article
• Language: English
• Published: United States 03-01-1994
• Subjects: 360207 - Ceramics, Cermets, & Refractories- Superconducting Properties- (1992-); ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BARIUM OXIDES; CHALCOGENIDES; COPPER COMPOUNDS; COPPER OXIDES; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; GRAIN BOUNDARIES; HIGH-TC SUPERCONDUCTORS; JOSEPHSON EFFECT; MAGNETIC FLUX; MATERIALS SCIENCE; MELTING; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; SUPERCONDUCTORS; TEXTURE; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; YTTRIUM OXIDES
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.110909

We have investigated the electrical properties of small parts of single grain boundaries in melt textured YBa[sub 2]Cu[sub 3]O[sub [ital x]]. Similar measurements on grain boundary networks were also made to obtain composite properties. The results of [ital T][sub [ital c]] measurements and current-voltage characteristics in zero and small magnetic fields are presented. The [ital R]([ital T]) characteristics suggest that there is second phase segregation in some parts of the grain boundary area. The current-voltage characteristics showed three different types of behavior: Resistive, Josephson-like, and flux flow. The [ital I][sub [ital c]]([ital B]) data of Josephson junctions suggest that nonsuperconducting inclusions divide the grain boundaries into smaller single junctions.