Specific heat of a multiphase superconductor Bi1.71Pb0.43Sr1.71Ca2.14Cu3O10.29

✍ Scribed by M.K. Yu; J.P. Franck; S. Gygax

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 351 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80255-x

✦ Synopsis

We report on specific heat measurements in the range 2.7 to 25 K and 50 to 120 K on the high T c superconductor Bi l.7IPb0.43SrI.71 Ca2.l4Cu301O.29' The sample contains approximately 70% 2223 phase and 30% 2212 phase, with transition temperatures near] 08.9 and 82 K. Small discontinuities in CIif of 37 mJ/moleK2 (2223 phase) and 11 mJ/mole K2 (2212 phase) are observed. Fitting of the data in the range 2.7 to 8 K to the function C p = A/T 3 + BIT5 + if + aT3 + ~T5 leads to a vanishing y. Representing the lattice term by a sum of atomic Debye functions, one finds that a second anomaly exists in the range 5 to 30 K. It is not of lattice origin, but either a Schottky or spin glass anomaly. The anomaly has a maximum of 1.8 J/mole K at a temperature of ] 7 K.