| SM ISO690:2012|
PRODAN, Lilian; FELEA, Viorel; FILIPPOVA, Irina; GUNTHER, A.; TSURKAN, Vladimir. Growth of Fe1-xCuxCr2S4 single crystals and investigation of magnetic, structural and galvanomagnetic properties. In: Materials Science and Condensed Matter Physics. Editia a 7-a, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, p. 117.
|Materials Science and Condensed Matter Physics
Editia a 7-a, 2014
Conferința "Materials Science and Condensed Matter Physics" |
Chișinău, Moldova, 16-19 septembrie 2014
Magnetic AB2JGi compounds with spinel stmcture recently have attracted much attention because of strong magnetic frustration effects resulting in unconventional ground states like spin-liquid, spinorbital liquid and spin-orbital glass. A number of new physical effect like colossal magnetoresistance , colossal magnetocapacitance and shift of absorption edge in the IR region  were discovered which are of prospective for application in spintronic and magneto-optical devices. The single crystals were grown by chemical transpo1i reactions method. X-ray diffraction was perfo1med utilizing STADI-P (STOE&CIE). Magnetization was measured with a commercial SQUID magnetometer (MPMS-5, Quantum Design) in a temperature range 2 K - 400 K at the Institute of Physics of University of Ausburg, Gennany. Hall effect and magnetoresistense were measured at room temperature using an installation with automatic data acquisition. Using chemical transport reactions method the single c1ystals of Fe1_xCuxCr2S4 system with different substitution concentrations (x=0.4, 0.5, 0.6) have been grown. It was proved experimentally that with increasing substitution concentration the lattice parameter decreases but the magnetic moment and the Curie temperature increase. It was shown that replacing the transpo1i agent clor with bromine, the Curie temperature of the single c1ystals grows considerably and approaches that of the stoichiometric powder samples (Fig. 1). The study of the magnetic prope1iies of the c1ystals from this system allowed to highlight variation of the magnetic exchange interactions. The study of the galvanomagnetic effects (Hall effect and colossal magnetoresistance ) have shown substantial value of the anomalous Hall coefficient, which is related to spin-orbit interaction and indicates strong coupling between charge can-iers and magnetic moments in these c1ystals. The measurements of the magnetoresistance in magnetic field 6T have confumed the colossal origin of this effect.