Superconducting and magnetic properties of Sn-doped Ru-1222
| Autor: | B. Kunev, Konstantin Nenkov, J. Pirov, N. Balchev, G. Mihova |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Superconductivity
Cerium oxide Materials science Dopant Condensed matter physics Magnetism Doping Analytical chemistry Energy Engineering and Power Technology Condensed Matter Physics Ruthenium oxide Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Electrical and Electronic Engineering Strontium oxide Chemical composition |
| Zdroj: | Physica C: Superconductivity and its Applications. 467:174-178 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/j.physc.2007.10.008 |
| Popis: | Samples with nominal compositions Ru 1 −x Sn x Sr 2 Gd 1.4 Ce 0.6 Cu 2 O y (0 ⩽ x ⩽ 0.2) were synthesized and their superconducting and magnetic properties were investigated. A non-monotonic behaviour of the lattice parameters and T c with the increase of the dopant content was observed. It was established that small doping levels (0 x ⩽ 0.05) significantly increase the T c of the Ru-1222 samples, prepared at the same conditions – from 20 K for the undoped sample to 35 K for the x = 0.03 one. The 0.1 ⩽ x ⩽ 0.2 samples are not superconducting, i.e. the Sn-doping more rapidly destroys the superconductivity in Ru-1222 than in the conventional superconductors. The initial increase of T c was associated with an increase of the hole concentration. The decrease of T c and suppression of SC at higher doping levels may be explained by an enhanced disorder in the system, due to a possible presence of Sn in both Ru and Cu sites. The latter fact could also explain that the onset of the magnetic transition T mag weakly depends on the dopant content. |
| Databáze: | OpenAIRE |
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