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- Title
Transport properties and ferromagnetism of Co<sub> x </sub>Mn<sub>1 − x </sub>S sulfides.
- Authors
Aplesnin, S. S.; Ryabinkina, L. I.; Romanova, O. B.; Velikanov, D. A.; Balaev, A. D.; Balaev, D. A.; Yanushkevich, K. I.; Galyas, A. I.; Demidenko, O. F.; Bandurina, O. N.
- Abstract
We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80–1000 K, the magnetic susceptibility and magnetization in a temperature range of T = 4.2–300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of Co x Mn1− x S sulfides (0 ≤ x ≤ 0.4). Anomalies in the transport properties of these compounds have been found in the temperature intervals Δ T 1 = 200–270 K and Δ T 2 = 530–670 K and at T 3 ∼ T N. The temperature dependences of the magnetic susceptibility, magnetization, and resistivity, as well as the current-voltage characteristics, exhibit hysteresis. In the domain of magnetic ordering at temperatures below the Néel temperature ( T N), the antiferromagnetic Co x Mn1− x S sulfides possess a spontaneous magnetic moment that is explained using a model of the orbital ordering of electrons in the t 2 g bands. The influence of the cobalt-ion-induced charge ordering on the transport and magnetic properties of sulfides has been studied. The calculated values of the temperatures corresponding to the maxima of charge susceptibility, which are related to a competition between the on-site Coulomb interaction of holes in various subbands and their weak hybridization, agree well with the experimental data.
- Subjects
FERROMAGNETISM; THERMAL electromotive force; TRANSITION metals; MAGNETIC properties; MAGNETIC fields
- Publication
Journal of Experimental & Theoretical Physics, 2008, Vol 106, Issue 4, p765
- ISSN
1063-7761
- Publication type
Article
- DOI
10.1134/S1063776108040158