Growth of FeTe single crystals and investigation of structure and magnetic properties
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2023-11-07 07:46
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CROITORI, Dorina. Growth of FeTe single crystals and investigation of structure and magnetic properties. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 108. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Growth of FeTe single crystals and investigation of structure and magnetic properties


Pag. 108-108

Croitori Dorina
 
Institute of Applied Physics, Academy of Sciences of Moldova
 
 
Disponibil în IBN: 22 iulie 2019


Rezumat

The discovery in 2008 of superconductivity in layered LaAsO1-xFx with transition temperature TC = 26 K [1] captured the imaginations of physicists worldwide. In short time, other Fe-based superconductors with the similar crystal structure were discovered with TC up to 56 K. We report on structure and magnetic studies of Fe1+xTe single crystals grown by the Bridgman method [2]. The respective amount of Fe and Te powders of a purity of 99.99 % for Fe and 99.999% for Te, were used in the growth process. The pulling rates were between 0.5 and 2 mm/h and the rotation speed of 2-5 turns/min. This compound crystallizes in the tetragonal structure within the space group P4/nmm. The crystal structure of FeTe samples was determined by X-ray diffraction method at room temperature. No impurities were detected. The chemical composition of Fe1.06Te was determined by Reitveld refinement method using FULLPROF SUITE program [3]. The main structural parameters, such as lattice constants (a=b=3.823 Å and c=6.286 Å), were determined. The magnetic measurements were performed in a temperature range 2K– 400 K and in magnetic fields up to 50 kOe using a MPMS 5 SQUID magnetometer. Figure 1 shows the temperature dependence of the magnetic susceptibility of single-crystalline sample under 10 kOe magnetic field. The magnetic susceptibility of Fe1.06Te continuously increases with decreasing temperature up to 65 K, then decreases sharply below this temperature. Respectively, at temperatures of 65 K the phase transition from the paramagnetic state into the state with antiferromagnetic ordering occurs. The calculated effective magnetic moment is 3.70 μB. This value differ significantly from the expected value of 4.9 μB for localized ion Fe2+ in the high-spin state. Figure1. Temperature dependence of the susceptibility of Fe1.06Te measured in a field of 10kOe applied along the c-axis. The magnetization measurements allowed the determination of the basic magnetic parameters, such as transition temperature TN = 65 K and the Curie-Weiss temperature ΘCW = -203 K. Thus, it has been concluded that the magnetic ground state of Fe1.06Te is antiferromagnetic.