Low-temperature specific heat of polycrystallineYBa2Cu3O6.70in applied magnetic fields of 0, 1, 2, and 3 T
| Autor: | R. A. Schweinfurth, S. E. Stupp, D. M. Ginsberg, D. J. Van Harlingen, J. P. Rice, T. A. Friedmann |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
chemistry.chemical_classification
Superconductivity Materials science High-temperature superconductivity Condensed matter physics Transition temperature Magnetic susceptibility law.invention London equations chemistry law Condensed Matter::Superconductivity X-ray crystallography Diamagnetism Inorganic compound |
| Zdroj: | Physical Review B. 43:13073-13079 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.43.13073 |
| Popis: | We have measured the specific heat of sintered YBa{sub 2}Cu{sub 3}O{sub 6.70} powder between 1.85 and 77 K in zero magnetic field, and between 1.75 and 9.5 K in applied fields up to 3 T. The sample was characterized by x-ray diffraction, scanning electron microscopy, iodometric titration, and magnetic susceptibility. The onset of the diamagnetic transition to the superconducting state occurred at {ital T}{sub {ital c}}=67 K. For the specific heat in nonzero applied magnetic field, there is an increase in the magnitude of the term that is linear in temperature, and a decrease in the term that is cubic in temperature. These results agree with earlier results on the {ital T}{sub {ital c}}=90 K phase of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. The data for nonzero applied fields were analyzed by using Ginzburg-Landau theory in the London limit for a uniaxially symmetric superconductor. |
| Databáze: | OpenAIRE |
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