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Spin Crossover in Cu_{x}Co_{y}Cr_{z}Se_4 Semiconductors

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Maciążek E., Groń T., Pacyna A., Mydlarz T., Zawisza B., Krok-Kowalski J.
Acta Physica Polonica A
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2011
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vol. 119
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issue 5
711-713
EN
Magnetization and magnetic susceptibility measured in the zero-field-cooled mode were used to study the spin crossover transition in polycrystalline Cu_{x}Co_{y}Cr_{z}Se_4 compounds. With increasing Co content a transition from ferromagnetic order via ferrimagnetic one to antiferromagnetic-like behaviour was observed. This transition is accompanied with a lowering symmetry from cubic to monoclinic and for the latter the spin crossover phenomenon occurs. These results are considered in a framework of the ligand-field split and the spin-orbit coupling.
2
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Mictomagnetic Order in Cd_{0.87}Cr_{1.93}V_{0.06}Se_4 Semiconductor

100%
Groń T., Malicka E., Zawisza B., Duda H., Krok-Kowalski J., Pacyna A.
Acta Physica Polonica A
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2011
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vol. 119
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issue 5
714-716
EN
The complex ac dynamic magnetic susceptibility was used to study the mictomagnetic-like behavior in polycrystalline Cd_{0.87}Cr_{1.93}V_{0.06}Se_4 spinel. The temperature dependences of the zero field in-phase (real part) and out-of-phase (imaginary part) components of fundamental susceptibility measured at the oscillating field H_{ac} = 0.5 Oe and at the constant frequency of 125 Hz are characteristic for the mictomagnetic order. These results well correlate with the anomalies in the second and third harmonics of the ac susceptibility indicating the cluster glass.
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The Mössbauer and X-Ray Studies οf the Spinel Ferrites Cu_{0.5}Fe_{0.5}Cr_2Se_4 and Cu_{0.2}Fe_{0.8}Cr_2Se_4 Prepared by the Ceramic Method

100%
Maciążek E., Hanc A., Sitko R., Zawisza B., Jendrzejewska I., Mrzigod J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1599-1603
EN
Seleno-spinels with nominal chemical composition Cu_{0.5}Fe_{0.5}Cr_2Se_4 and Cu_{0.2}Fe_{0.8}Cr_2Se_4 were prepared as polycrystalline samples using ceramic method. The assumed composition was verified by wavelength-dispersive X-ray fluorescence spectrometry. The X-ray analysis was carried out in order to make phase analysis and to compare its results with those obtained with the Mössbauer spectroscopy.
4
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Electrical and Magnetic Studies of the Cd_{x}Cr_{y}V_{z}Se_{4} Spinels

100%
Groń T., Duda H., Malicka E., Zawisza B., Krok-Kowalski J., Pacyna A.
Acta Physica Polonica A
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2009
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vol. 116
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issue 5
969-970
EN
The electrical and magnetic investigations carried out on the polycrystalline spinels with the general chemical formula Cd_{x}Cr_{y}V_{z}Se_{4} (where z = 0.06, 0.12, 0.24, and 0.31) revealed semiconducting and ferromagnetic properties with a Curie temperature of 127.5 K. A step-like structure of the electrical conductivity, σ(T), was observed for the polycrystal containing 6% V ions in the octahedral sites while the remaining samples showed a typical Arrhenius behaviour of σ(T). These effects are interpreted in terms of ferromagnetic spin clusters which finally dissolve on going towards the paramagnetic limit including non-stoichiometry.
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