Specific heat anomalies in the 108 K superconducting system Y1-xCaxSr2Cu2Tl.5Pb.5O7
- 1 January 1991
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 4 (1S) , S286-S288
- https://doi.org/10.1088/0953-2048/4/1s/081
Abstract
The authors show the progression with x of the superconducting specific heat anomalies in Y1-xCaxSr2Cu2TI.5Pb.5O7. The system is superconducting above x=.5 and Tc shows a broad maximum at x=.8. The size of the specific heat anomaly peaks very much more sharply than Tc, reflecting a correspondingly rapid variation with x of the superconducting pair density, similar to the behavior previously observed in La2-xSrxCuO4. At low temperatures they observe a 'magnetic' term which anticorrelates with the size of the anomaly at Tc but no additional electronic term.Keywords
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