Susceptibility and remanence studies in the quasi-1D mixed ferromagnet CoTAC : Mn
Identifieur interne : 000503 ( France/Analysis ); précédent : 000502; suivant : 000504Susceptibility and remanence studies in the quasi-1D mixed ferromagnet CoTAC : Mn
Auteurs : A. Cheikhrouhou [France] ; C. Dupas [France] ; J. P. Renard [France] ; P. Veillet [France]Source :
- Journal of Magnetism and Magnetic Materials [ 0304-8853 ] ; 1985.
Abstract
The ac susceptibility and dc magnetization of CoTAC : Mn ((CH3)3NHCo1−xMnxCl3⋅2H2O) have been studied in the temperature range 1.3–4.2 K on two monocrystalline samples with x = 2.9 and 9.3%. In CoTAC : Mn (9.3%), the variation with the measuring frequency ν of the temperature of the susceptibility maximum Tg(ν) is well described over five decades of frequency by an Arrhenius law Tg-1(ν) = a − b log ν characteristic of superparamagnetic clusters. In CoTAC : Mn (2.9%) Tg(ν) does not differ significantly from that of pure CoTAC. Both compounds exhibit strong remanence effects below Tg. The variations with time, temperature and applied magnetic field of the IRM and TRM are similar to those observed in spin glasses. These experiments confirm the onset of spin-glass-like behaviour or superparamagnetism in quasi-1D insulators with random intrachain exchange at very low impurity concentration. Comparison with the previously studied mixed compound CHAC : Mn evidences the influence of the exchange anisotropy on the static properties of these systems.
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DOI: 10.1016/0304-8853(85)90122-2
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In CoTAC : Mn (9.3%), the variation with the measuring frequency ν of the temperature of the susceptibility maximum Tg(ν) is well described over five decades of frequency by an Arrhenius law Tg-1(ν) = a − b log ν characteristic of superparamagnetic clusters. In CoTAC : Mn (2.9%) Tg(ν) does not differ significantly from that of pure CoTAC. Both compounds exhibit strong remanence effects below Tg. The variations with time, temperature and applied magnetic field of the IRM and TRM are similar to those observed in spin glasses. These experiments confirm the onset of spin-glass-like behaviour or superparamagnetism in quasi-1D insulators with random intrachain exchange at very low impurity concentration. Comparison with the previously studied mixed compound CHAC : Mn evidences the influence of the exchange anisotropy on the static properties of these systems.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Île-de-France</li></region><settlement><li>Orsay</li></settlement><orgName><li>Université Paris-Sud</li></orgName></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Cheikhrouhou, A" sort="Cheikhrouhou, A" uniqKey="Cheikhrouhou A" first="A." last="Cheikhrouhou">A. Cheikhrouhou</name></region><name sortKey="Dupas, C" sort="Dupas, C" uniqKey="Dupas C" first="C." last="Dupas">C. Dupas</name><name sortKey="Renard, J P" sort="Renard, J P" uniqKey="Renard J" first="J. P." last="Renard">J. P. Renard</name><name sortKey="Veillet, P" sort="Veillet, P" uniqKey="Veillet P" first="P." last="Veillet">P. Veillet</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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