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- W2037519284 abstract "Thermodynamic measurements on high Tc superconductors reflect true bulk properties in contrast to e.g. transport, diamagnetic shielding or even Meissner measurements. This adds a new dimension, the superconducting volume, to other characterizations. We report and discuss specific heat data from our laboratory for YBa2Cu3O7−δ (YBCO 123) with differing δ's, for the 80K-phase YBa2Cu4O8 (YBCO 124), for Bi2−xPbxSr2CaCu2O8 (BSCCO 2212) and for Tl2Ba2Can−1CunO2n+4 (TBCCO), in correlation with Meissner effect and susceptibility. Based on numerous samples, we address questions such as the value of the Sommerfeld constant (γ), anharmonicity, limiting low-temperature behavior (γ*T), susceptibility vs hole concentration, origin, shape and amplitude of the specific heat jump at Tc. The unusual response of the specific heat anomaly at Tc to various kinds of perturbation (Cu substitutions, oxygen vacancies, magnetic field) is distinct from that of classical superconductors and suggests a unified origin. We argue that it results from the existence of a disordered “mixed state” (in H=O) stabilized by defects at the atomic scale in small - ξ superconductors. A new type of phase diagram that embodies the variation of the superconducting volume as a function of temperature and effective defect size must be considered." @default.
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- W2037519284 date "1989-12-01" @default.
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- W2037519284 title "Thermodynamic and magnetic properties of oxide superconductors" @default.
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- W2037519284 doi "https://doi.org/10.1016/0921-4534(89)90750-8" @default.
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