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

Seidov Z.; Gunther A.; Filippova Irina; Krug Von Nidda Hans Albrecht; Tsurkan Vladimir; Loidl Alois

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2022-03-19 14:46

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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

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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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