On the influence of magnetic and nonmagnetic impurities on the properties of yttrium-based high-Tc superconductors
| Autor: | M. Ya. Chubabria, R. G. Kokhreidze, S. V. Odenov, A. N. Mestvirishvili, N. A. Papunashvili, J. G. Sanikidze, G. A. Mumladze |
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| Rok vydání: | 2005 |
| Předmět: |
Superconductivity
High-temperature superconductivity Materials science Physics and Astronomy (miscellaneous) Condensed matter physics General Physics and Astronomy chemistry.chemical_element Yttrium Magnetic susceptibility law.invention Nickel chemistry law Impurity Condensed Matter::Superconductivity Percolation Condensed Matter::Strongly Correlated Electrons Gallium |
| Zdroj: | Low Temperature Physics. 31:486-489 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.1943532 |
| Popis: | The influence of impurities on the physical properties of YBa2Cu3O7−δ superconducting ceramics is investigated. Samples of yttrium ceramics with different Ni, Zn, Co, Fe, and Ga impurity contents were prepared for this study, and the superconducting fraction, the low-frequency susceptibility in an external dc field, and the temperature dependence of the magnetic susceptibility in a weak ac field were measured for each sample. The last of these measurements permits a more precise determination of the critical temperature (the start of the transition) without regard for percolation effects. The experimental results show a stronger suppression of the superconducting state by nonmagnetic impurities, thus confirming the presence of d-state pairs in these superconductors. The degree of suppression of superconductivity by magnetic impurities depends on the preference of the impurities to locate in Cu(1) or Cu(2) sites. |
| Databáze: | OpenAIRE |
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