Normal and superconducting state magnetic properties of RBa2Cu3O7−δ compounds
| Autor: | M. B. Maple, R.R. Hake, K. N. Yang, Bo Wha Lee, Y. Dalichaouch, Robert P. Guertin, M.V. Kuric, H. Zhou, C. L. Seaman |
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| Rok vydání: | 1988 |
| Předmět: |
Superconductivity
Materials science Field (physics) Condensed matter physics Rare earth Analytical chemistry Energy Engineering and Power Technology State (functional analysis) Condensed Matter Physics Electronic Optical and Magnetic Materials Ion Hysteresis Crystallite Electrical and Electronic Engineering Order of magnitude |
| Zdroj: | Physica C: Superconductivity. 152:321-328 |
| ISSN: | 0921-4534 |
| Popis: | Magnetic properties have been investigated for polycrystalline samples of RBa 2 Cu 2 O 7−δ with R = Y and all the rare earth elements except Pm. The normal-state magnetic susceptibilities of these compounds can be described as χ ( T )= χ 0 + Nμ 2 eff /[3 k b ( T − ϑ )], with μ eff comparable to the values of free R 3+ ions. The superconducting-state magnetizations for all measured superconducting compounds are very different for different R while the field and temperature dependence of critical current densities J c ( H , T ) inferred from the hysteresis of M ( H ) isotherms at different temperatures are similar. J c decreases with H , rapidly in low fields and slowly in high fields, and decreases by two orders of magnitude as the temperatures increase from 4.2 to 65 K. At 4.2 K and 180 kOe, the critical current densities of Gd, Yb, and Tm compounds range from 1.6 to 17 kA/cm 2 . |
| Databáze: | OpenAIRE |
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