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Effect of Chemical Disorder on Geometrically Frustrated Kagome Lattice

100%
Szymczak H., Szymczak R., Baran M., Fink-Finowicki J., Krzymanska B., Aleshkevych P., Jezierski A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
35-42
EN
This paper reviews recent progress in the studies of magnetic dilutions on magnetic properties of two frustrated systems: magnetoplumbite-like SrGa_{12-x}Cr_xO_{19} and kagome staircase Co_3V_2O_8 doped with Mg ions. In the first group of compounds magnetic properties are determined by magnetic defects arising due to doping. In the case of kagome staircase compounds magnetic dilution suppresses effects of crystal field acting on magnetic ions. In particular, the dilution decreases magnetocrystalline anisotropy and anisotropy of magnetization.
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Geometrically Frustrated Kagome Lattice with Chemical Disorder

100%
Szymczak R., Baran M., Fink-Finowicki J., Krzymanska B., Aleshkevych P., Szymczak H.
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EN
The effect of nonmagnetic Mg^{2+} and magnetic Co^{2+} doping in Kagome compounds was investigated using DC magnetic susceptibility. The main effect of doping is to change the crystal field parameters. It was shown that Co^{2+} doping increases considerably crystal field parameters in Ni_3V_2O_8 while doping with nonmagnetic Mg^{2+} ions decreases considerably crystal field parameters in Co_3V_2O_8 crystals.
3
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Origin of Magnetic Anisotropy of Gd_{5}Si_{2}Ge_{2} Compound

84%
Szymczak R., Kolano R., Kolano-Burian A., Hawelek L., Krzymanska B., Aleshkevich P., Dyakonov V., Szymczak H.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1261-1262
EN
The second-order anisotropy constant K_2 in polycrystalline Gd_5Si_2Ge_2 giant magnetocaloric material was measured as a function of temperature by the modified singular point detection technique. Although the structural, electrical, thermal, magnetic and magnetocaloric properties of the Gd_5Si_2Ge_2 have been rather well investigated experimentally, magnetic anisotropy of this system is almost unknown. The singularity indicating the anisotropy field was determined analyzing ac susceptibility data taking into account several features of the magnetization curve. The temperature dependence of the anisotropy fields was measured from 4.2 K up to the Curie temperature. The observed relationship between K_2 (T)/K_2 (0) and magnetization M (T)/M (0) was explained assuming dipolar origin of magnetic anisotropy of Gd_5Si_2Ge_2 compound.
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