Fluctuation specific heat and thermal expansion of YBaCuO and DyBaCuO

✍ Scribed by W. Schnelle; E. Braun; H. Broicher; R. Dömel; S. Ruppel; W. Braunisch; J. Harnischmacher; D. Wohlleben

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 755 KB
• Volume: 168
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(90)90063-k

✦ Synopsis

We present high resolution specific heat measurements and thermal expansion data of YBa2Cu3OT_6 and DyBa2Cu3OT_,~ po-lyerystaUine samples in the temperature range 20-300 IC The specific heat anomaly at T¢ shows strong deviations from mean field behavior due to superconducting fluctuations. The fluctuation behaviour seems to be more complicated than simply Gaussian. The thermal expansion shows clear anomalies at the Tc's of the samples. Additionally we give an estimate of the Griineisen functions and discuss data of the low field DC Meissner effect in connection with the grain structure of the samples.