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Susceptibility and remanence studies in the quasi-1D mixed ferromagnet CoTAC : Mn

Identifieur interne : 000F17 ( Istex/Corpus ); précédent : 000F16; suivant : 000F18

Susceptibility and remanence studies in the quasi-1D mixed ferromagnet CoTAC : Mn

Auteurs : A. Cheikhrouhou ; C. Dupas ; J. P. Renard ; P. Veillet

Source :

RBID : ISTEX:3AD8F80B6ECAED1068581D37ECE43F0E13D56154

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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ISTEX:3AD8F80B6ECAED1068581D37ECE43F0E13D56154

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<abstract lang="en">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.</abstract>
<relatedItem type="host">
<titleInfo>
<title>Journal of Magnetism and Magnetic Materials</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>MAGMA</title>
</titleInfo>
<genre type="journal">journal</genre>
<originInfo>
<dateIssued encoding="w3cdtf">198503</dateIssued>
</originInfo>
<identifier type="ISSN">0304-8853</identifier>
<identifier type="PII">S0304-8853(00)X0284-3</identifier>
<part>
<date>198503</date>
<detail type="volume">
<number>49</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>1–2</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>1</start>
<end>218</end>
</extent>
<extent unit="pages">
<start>201</start>
<end>209</end>
</extent>
</part>
</relatedItem>
<identifier type="istex">3AD8F80B6ECAED1068581D37ECE43F0E13D56154</identifier>
<identifier type="DOI">10.1016/0304-8853(85)90122-2</identifier>
<identifier type="PII">0304-8853(85)90122-2</identifier>
<recordInfo>
<recordContentSource>ELSEVIER</recordContentSource>
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<serie></serie>
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   |texte=   Susceptibility and remanence studies in the quasi-1D mixed ferromagnet CoTAC : Mn
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