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<creators>
<creator>
<creatorName>Seidov, Z.</creatorName>
<affiliation>Institute of Physics, Azerbaijan National Academy of Sciences, Azerbaijan</affiliation>
</creator>
<creator>
<creatorName>Günther, A.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Filippova, I.G.</creatorName>
<affiliation>Institutul de Fizică Aplicată al AŞM, Moldova, Republica</affiliation>
</creator>
<creator>
<creatorName>Krug Von Nidda, H.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Ţurcan, V.V.</creatorName>
<affiliation>Universitatea Augsburg, Germania</affiliation>
</creator>
<creator>
<creatorName>Loidl, A.</creatorName>
</creator>
</creators>
<titles>
<title xml:lang='en'>Magnetic properties of the covalent chain antiferromagnets RbFeSe2 and TlFeX2 (X=S, Se)</title>
</titles>
<publisher>Instrumentul Bibliometric National</publisher>
<publicationYear>2014</publicationYear>
<relatedIdentifier relatedIdentifierType='ISBN' relationType='IsPartOf'></relatedIdentifier>
<dates>
<date dateType='Issued'>2014</date>
</dates>
<resourceType resourceTypeGeneral='Text'>Conference Paper</resourceType>
<descriptions>
<description xml:lang='en' descriptionType='Abstract'><p>Single crystals of the temruy iron chalcogenides RbFeSe2, T1FeS2, and T1FeSe2 have been investigated by means of X-ray diffraction, magnetic susceptibility, magnetization, specific heat, and electron-spin resonance (ESR) measurements. The crystal strncture of RbFeSe2 is shown in Fig. 1. The FeSe4 tetrahedra build infinite chains along the c-direction and are separnted by the Rb alkali atoms. All three compounds exhibit three-dimensional collinear antife1rnmagnetic order with strongly reduced moments below T r248 K, 196 K, and 290 K, respectively. The magnetic moments ru&middot;e oriented perpendicular to the chain direction. The specific heat measurements ofT1FeX2 (X=S, Se) do not show any anomaly at TN [l]. The specific heat of RbFeSe2 was measured by a relaxation method using a PPMS Quantum Design in the temperature range 1.8 K :ST :S 300 K and in magnetic fields up to 90 kOe. The magnetic field was applied perpendicular to the chain direction. Fig. 2 shows the specific heat C(l) as function of temperature for RbFeSe2. The temperature (TN = 248K) at which a small A-like anomaly is obse1ved in the C(T) data is the same at which a discontinuity in the slope in the temperature dependence of the magnetic susceptibility x(l) was found. However, the calculated entropy for RbFeSe2 is much smaller than expected for a low-spin S=1/2 Fe3+ system. The linear increase of the paramagnetic susceptibility and ESR intensity of RbFeSe2 and TlFeX2 (X=S, Se) strongly suggests a one-dimensional metallic character at high temperatures. This is an evidence of a long-range AFM order.</p></description>
</descriptions>
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