Longitudinal spin fluctuations in thermal and magnetic properties of TlCo2Se2−xSx
| Autor: | E. A. Popova, R.M. Scherbov, R. Z. Levitin, Alexander N. Vasiliev, Sabina Ronneteg, Rolf Berger |
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| Rok vydání: | 2004 |
| Předmět: |
Materials science
Condensed matter physics Magnetic moment Phonon Condensed Matter Physics Magnetic susceptibility Heat capacity Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Ferromagnetism Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Spin (physics) Metamagnetism |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 281:388-393 |
| ISSN: | 0304-8853 |
| DOI: | 10.1016/j.jmmm.2004.05.002 |
| Popis: | At isovalent substitution of Se for S, the layered chalcogenides TlCo 2 Se 2− x S x (0⩽ x ⩽2) exhibit a change of magnetic order type, from an antiferromagnetic helix at low S content to a ferromagnet at high S content. The effective magnetic moments p eff ∼2 μ B per Co, as estimated from the magnetic susceptibility at high temperatures, significantly exceed what would be the result of the Co magnetic moments μ sat ∼0.5 μ B in both the ferromagnetic and antiferromagnetic phases. This signifies the crucial role of longitudinal spin fluctuations in the magnetic behaviour of these conducting compounds. The spin fluctuations reveal themselves also in specific heat measurements, leading to a diminution of the expected anomalies at the Curie/Neel temperatures and to an excess of heat capacity at high temperatures as compared to phonon contributions. |
| Databáze: | OpenAIRE |
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