| Autor: | Christophe Marcenat, Christoph Meingast, Rolf Lortz, I. Isaac, J. E. Gordon, Guanwen Zhang, Norman E. Phillips, F. Bouquet, Jurgen P. Franck, R. A. Fisher |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Curie–Weiss law
Materials science Colossal magnetoresistance Physics and Astronomy (miscellaneous) Condensed matter physics Transition temperature Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Paramagnetism Ferromagnetism Electrical resistivity and conductivity Percolation Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Journal of Superconductivity: Incorporating Novel Magnetism. 15:571-577 |
| ISSN: | 0896-1107 |
| DOI: | 10.1023/a:1021299225354 |
| Popis: | We present a study of the paramagnetic to ferromagnetic transition in the CMR compound La0.65Ca0.35MnO3 and its dependence on magnetic field and oxygen mass. The transition is characterized by two temperatures, the thermodynamic transition temperature at Tc, obtained from specific heat and thermal expansion data, and the resistive transition obtained from the resistivity maximum. The resistive transition occurs well within the paramagnetic range. The magnetic susceptibility in the paramagnetic range is isotope dependent up to 400 K. The magnitude of the Curie-Weiss constant indicates the presence of small clusters of about 4–5 unit cells. The resistive transition occurs when the percolation limit for these clusters is reached. |
| Databáze: | OpenAIRE |
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