Title :
Normal state electrical measurements near the ferroelastic phase transformation in single crystal YBa2Cu3O7-δ
Author :
LaGraff, J.R. ; Han, P.D. ; Payne, D.A.
Author_Institution :
Illinois Univ., Urbana, IL, USA
Abstract :
Normal state electrical resistance measurements were made on single crystal YBa2Cu3O7-δ over the temperature range 200-800°C in oxygen and argon atmospheres, and the twin structure was observed simultaneously by hot-stage optical microscopy. The resistance of the crystal maintained a linear metallic-type behavior to higher temperatures (500°C) than reported for bulk ceramic specimens. Anomalous resistance behavior was observed in the vicinity of the ferroelastic orthorhombic-to-tetragonal phase transformation under certain probe configurations and measuring conditions. Correlations between observed in situ twinning and resistance characteristics are discussed
Keywords :
barium compounds; electrical conductivity of crystalline semiconductors and insulators; ferroelastic transitions; high-temperature superconductors; optical microscopy; twinning; yttrium compounds; 200 to 800 degC; anomalous behaviour; ferroelastic orthorhombic-to-tetragonal phase transformation; ferroelastic phase transformation; high temperature superconductors; hot-stage optical microscopy; in situ twinning; metallic-type behavior; normal state electrical resistance; probe configurations; single crystal YBa2Cu3O7-δ; twin structure; Argon; Atmosphere; Atmospheric measurements; Ceramics; Electric resistance; Electric variables measurement; Electrical resistance measurement; Optical microscopy; Phase measurement; Temperature distribution;
Conference_Titel :
Applications of Ferroelectrics, 1990., IEEE 7th International Symposium on
Conference_Location :
Urbana-Champaign, IL
Print_ISBN :
0-7803-0190-0
DOI :
10.1109/ISAF.1990.200180
