Study of competitive magnetic interactions in the spinel compounds GeNi2O4, GeCo2O4
| Autor: | Pierre Strobel, Michael Holzapfel, Gérard Chouteau, Sébastien Diaz, Sophie de Brion |
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| Rok vydání: | 2004 |
| Předmět: |
Curie–Weiss law
Materials science Condensed matter physics media_common.quotation_subject Frustration Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Magnetization Ferromagnetism Antiferromagnetism Curie temperature Curie constant Electrical and Electronic Engineering media_common |
| Zdroj: | Physica B: Condensed Matter. :146-149 |
| ISSN: | 0921-4526 |
| Popis: | We will present here results on the magnetic properties of two compounds, GeCo 2 O 4 and GeNi 2 O 4 , obtained by magnetic susceptibility and high magnetic field magnetization measurements. GeCo 2 O 4 shows an antiferromagnetic behaviour with an ordering temperature T N =23 K and a Curie–Weiss temperature θ=+81 K . There is no apparent magnetic frustration. From the value of the Curie constant, we deduce that Co 2+ ions are in high spin S= 3 2 state and that they are bounded in pairs. We will discuss the possible origin of these pairs. In GeNi 2 O 4 , we observe a negative Curie–Weiss temperature (θ=−15 K ) . In this compound the ferromagnetic Ni–Ni direct interaction present in GeCo 2 O 4 cannot exist. Moreover, the nickel cations are not bounded in pairs as in the cobalt compound. We show that GeNi 2 O 4 is a good candidate for magnetic frustration. |
| Databáze: | OpenAIRE |
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