Magnetic properties of the covalent chain antiferromagnets RbFeSe2 and TlFeX2 (X=S, Se)
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SEIDOV, Z., GUNTHER, A., FILIPPOVA, Irina, KRUG VON NIDDA, Hans Albrecht, TSURKAN, Vladimir, LOIDL, Alois. Magnetic properties of the covalent chain antiferromagnets RbFeSe2 and TlFeX2 (X=S, Se). In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 124.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Magnetic properties of the covalent chain antiferromagnets RbFeSe2 and TlFeX2 (X=S, Se)


Pag. 124-124

Seidov Z.12, Gunther A.2, Filippova Irina3, Krug Von Nidda Hans Albrecht2, Tsurkan Vladimir23, Loidl Alois
 
1 Institute of Physics, Azerbaijan National Academy of Sciences,
2 University of Augsburg,
3 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 4 martie 2019


Rezumat

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·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.

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<dc:creator>Seidov, Z.</dc:creator>
<dc:creator>Günther, A.</dc:creator>
<dc:creator>Filippova, I.G.</dc:creator>
<dc:creator>Krug Von Nidda, H.</dc:creator>
<dc:creator>Ţurcan, V.V.</dc:creator>
<dc:creator>Loidl, A.</dc:creator>
<dc:date>2014</dc:date>
<dc:description xml:lang='en'><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></dc:description>
<dc:source>Materials Science and Condensed Matter Physics (Editia 7) 124-124</dc:source>
<dc:title>Magnetic properties of the covalent chain antiferromagnets RbFeSe2 and TlFeX2 (X=S, Se)</dc:title>
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