Boron substitution in ternary metal phosphide superconductors
| Autor: | Robert J. Cava, R. E. Schaak |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Superconductivity
Materials science Phosphide Mechanical Engineering Transition temperature Intermetallic chemistry.chemical_element Condensed Matter Physics Crystallography Tetragonal crystal system chemistry.chemical_compound chemistry Mechanics of Materials X-ray crystallography General Materials Science Boron Ternary operation |
| Zdroj: | Materials Research Bulletin. 39:1231-1235 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2004.04.011 |
| Popis: | Partial substitution of boron for phosphorus in the ternary phosphide superconductors ZrRuP and LaRu2P2 induces highly anisotropic structural changes and suppresses the superconducting transition temperatures. Undoped ZrRuP [hexagonal, a=6.445(4) A, c=3.765(2) A] systematically expands for ZrRuP1−xBx (x=0.05, 0.10, 0.15, 0.20, 0.40) in the a direction to 6.949(4) A and shrinks in the c direction to 3.601(3) A. Superconductivity is still present in the boron-substituted samples, although Tc drops from 10.1 K in ZrRuP to 5.6 K in ZrRuP0.6B0.4. LaRu2P2 [tetragonal, a=4.032(2) A, c=10.632(7) A] remains essentially unchanged along the a axis [a=4.037(1) A] upon substitution at a starting composition of LaRu2P1.6B0.4, but shrinks along the c axis to 10.477(5) A. Accordingly, the superconducting Tc drops from 4.0 K for LaRu2P2 to 2.0 K for LaRu2P1.6B0.4. |
| Databáze: | OpenAIRE |
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