Specific heat of Bi2Sr2CaCu2Ox versus oxygen content (0≤B≤14T)

✍ Scribed by A. Junod; K.-Q. Wang; G. Triscone; J. Muller

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 156 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91248-3

✦ Synopsis

In order to characterize more precisely the superconducting transition of a quasi-2D superconductor, we quenched polycrystalline samples of Bi2Sr2CaCu20 x from various locations of the (T; P(O2)) equilibrium diagram. A well-defined specific heat peak at T c is observed with 0.01% resolution for the samples with the highest T c. The samples with lower Tc'S provide strong support to the normal-state background determined by an analysis of the data including phonon and fluctuation terms. We do not find any indication of a mean-field jump within experimental uncertainty, in stark contrast to YBa2Cu307. The application of a 14 Tesla field depresses the total specific heat by 0.54% only at T(peak)=92.5K, but this effect reduces to less than 0.03% already ±8K away from T c. On passing the irreversibility line, no anomaly in the specific heat is detected at the 0.01% level.