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1
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Magnetic Phase Transitions in Pure and Cobalt-Doped Geometrically Frustrated Ni_3V_2O_8 Single Crystals

100%
Szymczak H., Baran M., Szymczak R., Barilo S., Bychkov G., Shiryaev S.
Acta Physica Polonica A
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2007
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vol. 111
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issue 1
71-77
EN
The results of magnetic measurements performed on geometrically frustrated Ni_3V_2O_8 and Ni_{3(1-x)}Co_{3x}V_2O_8 single crystals with x=0.03 are presented. It was found that Co doping did not change considerably the magnetic H-T phase diagram. Although no spin-glass effects were observed, nevertheless, a strong effect of 3 at% cobalt doping was evidenced. The main effect of Co-doping concerns the direction of the antiferromagnetic vector, which for Ni_3V_2O_8 appears along the $a$ axis, while for only slightly Co doped crystals - along the $c$ axis. This switching of direction results from distinct changes of the magnetocrystalline anisotropy due to the presence of Co^{2+} ions strongly coupled to the kagome lattice. The disorder introduced by doping has practically no effect on the magnitude of the isotropic exchange interactions. At the same time the doping suppresses the Dzyaloshinskii-Moriya exchange interactions due to the change of direction of the antiferromagnetic vector.
2
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Field-Induced Magnetic Order in Frustrated TbBaCo_4O_7 Single Crystals

100%
Szymczak R., Bludov A., Gnatchenko S., Barilo S., Jezierski A., Szymczak H.
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issue 2
299-302
EN
We present results of dc magnetic susceptibility measurements in TbBaCo_4O_7 single crystals performed at temperatures in the range 2-300 K and in magnetic fields up to 55 kOe. The results obtained seem to suggest that the ground state of TbBaCo_4O_7 is composed of coexisting long-range ordered and short-range ordered clusters and is transformed into a magnetically ordered weak ferromagnetic phase by application high magnetic field along c-axis.
3
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Magnetic Properties of EuBaCo_2O_{5.5} Single Crystals

84%
Baran M., Barilo S., Bychkov G., Gatalskaya V., Kurochkin L., Shiryaev S., Szymczak R., Szymczak H.
Acta Physica Polonica A
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2004
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vol. 105
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issue 1-2
209-214
EN
The static magnetization of the EuBaCo_2O_{5.5} single crystals was measured from helium to room temperatures for two configurations of the applied field: parallel and perpendicular to the c-axis. The compound is antiferromagnetic from helium temperature to about 210 K. In low temperature region (below 45 K) the antiferromagnetism coexists with a spin-glass-like state. The metamagnetic field-induced phase transition was observed in the antiferromagnetic phase for magnetic field applied perpendicular to the c-axis. The spontaneous phase transition from antiferromagnetic to weak ferromagnetic phase was established to be of the first order. This transition is accompanied by the appearance of the intermediate state. The weak ferromagnetic phase exists up to T_c=240 K.
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