Superconductivity of ternary borides
| Autor: | Bernd T. Matthias |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Superconductivity
Tetragonal crystal system Materials science Ternary numeral system Condensed matter physics Electrical resistivity and conductivity Transition temperature Rare earth Physical and Theoretical Chemistry Condensed Matter Physics Ternary operation Atomic and Molecular Physics and Optics |
| Zdroj: | International Journal of Quantum Chemistry. 12:647-649 |
| ISSN: | 1097-461X 0020-7608 |
| DOI: | 10.1002/qua.560120870 |
| Popis: | A second superconducting ternary system of the form: XRh/sub 4/B/sub 4/ with X = Y, Nd, Sm, Er, Tm, Lu, and Th is now discovered in the last year. This phase is tetragonal and also forms with X = Gd, Tb, Dy, and Ho. The comparison of these new superconducting borides with the superconducting sulfides and selenides leads immediately to the rather astonishing conclusion that these ternary superconducting compounds with fairly high transition temperatures usually have the form A/sub x/B/sub y/C/sub z/ with x much less than y, x much less than z, and y approximately z. In other words, the third element A while entirely essential for the formation of the correct phase is, nevertheless, only a minor constituent or perturbation. Only very few superconducting compounds and no systems for which x, y, and z are comparable to one another whatsoever exist. The role of the minority element is also illustrated by the fact that in both systems, superconducting compounds with magnetic rare earth elements exist. |
| Databáze: | OpenAIRE |
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