Electrical measurements near the orthorhombic-tetragonal phase transformation in single crystal YBa2Cu3O7−δ

✍ Scribed by J.R. Lagraff; P.D. Han; D.A. Payne

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 452 KB
• Volume: 169
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90576-z

✦ Synopsis

Normal-state electrical resistance measurements were made on single crystal YBa2Cu307_6 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 orthorhombic-to-tetragonal phase transformation under certain probe configurations and measuring conditions. Correlations between observed in situ twinning and resistance characteristics are discussed.