Antiferromagnetism in Li substituted YBa2Cu3Oy studied by neutron powder diffraction measurements
| Autor: | Isabelle Mirebeau, M. Nicolas-Francillon, Françoise Bourée, F. Maury |
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| Rok vydání: | 2001 |
| Předmět: |
Materials science
Magnetic moment Magnetic structure Doping Neutron diffraction Analytical chemistry Energy Engineering and Power Technology chemistry.chemical_element Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Nuclear magnetic resonance chemistry Antiferromagnetism Lithium Electrical and Electronic Engineering Néel temperature |
| Zdroj: | Physica C: Superconductivity. 353:93-102 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/s0921-4534(00)01737-8 |
| Popis: | The magnetic structure of two well characterised YBa 2 Cu 3− x Li x O y samples, with similar Li concentrations, x =0.08–0.09, and slightly different oxygen concentrations, y =6.06 and y =6.18, has been studied by neutron powder diffraction measurements. The lithium substitution is found to induce a strong decrease of the Neel temperature and of the mean ordered magnetic moment on the Cu2 sites. T N is ≈245 K for y =6.06 instead of 415–400 K in unsubstituted YBa 2 Cu 3 O y with y =6.0–6.2. The mean ordered moment at low temperature, μ 0 / μ B , is 0.33±0.03 for y =6.06, and 0.17±0.08 for y =6.18, instead of 0.64 in unsubstitued YBCO. These measured values are compared with other data from the literature and the various possible mechanisms of the strong lithium effect are discussed. |
| Databáze: | OpenAIRE |
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