High field magnetic properties of Ag2FeGeSe4 in the temperature range 2–300K
| Autor: | P. Bocoranda, Jaime Gálvez Ruiz, Jesus Gonzalez, J.M. Broto, Manuel Morocoima, John C. Woolley, H. Rakoto, R. Cadenas, Miguel Quintero, E. Quintero, Rafael Tovar, G. Lamarche, A.-M. Lamarche |
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| Rok vydání: | 2003 |
| Předmět: |
Materials science
Magnetic domain Condensed matter physics Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Magnetization Magnetic shape-memory alloy Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Saturation (magnetic) Néel temperature Spin canting |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 257:87-94 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/s0304-8853(02)01051-x |
| Popis: | Measurements of low field static magnetic susceptibility and of magnetization with pulsed magnetic fields up to 32 T have been made as a function of temperature on polycrystalline samples of the compound Ag2FeGeSe4 (AFG) which has an orthorhombic wurtz–stannite structure. The resulting data have been used to give information on the magnetic spin-flop (SF) and magnetic saturation transitions. It was found that AFG has a Neel temperature of 240 K, shows mainly antiferromagnetic behaviour with a very weak superimposed ferromagnetic component down to 60 K. At 60 K, a transition occurs resulting in an appreciably larger ferromagnetic effect below the transition. The ferromagnetic component is attributed to spin canting, with the transition at 60 K due to a discontinuous change in the canting angle. Thus, the SF and saturation fields show very different behaviour below and above 60 K. Details of the magnetic B–T phase diagrams were determined for the two phases and the results compared with the predictions of theoretical uniaxial models. |
| Databáze: | OpenAIRE |
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