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3 results on '"Zapotokova, Mariana"'

1. The magnetic field induced ferromagnetism in EuPd$_2$Sn$_4$ novel compound

Author

Curlik, Ivan, Zapotokova, Mariana, Gastaldo, Federica, Reiffers, Marian, Sereni, Julian G., and Giovannini, Mauro

Subjects
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
Abstract

We report on crystal structure, magnetic and thermal physical properties of EuPd$_2$Sn$_4$ stannide. From the magnetic susceptibility measurements a divalent state of Eu rare earth element was determined together with an antiferromagnetic (AFM) order at 11 K. By applying magnetic field, the magnetic behavior variation reveals a complex magnetic structure. Above a critical field Bc a ferromagnetic (FM)-like character starts to prevail. AFM and FM regimes are separated by a metamagnetic region. Heat capacity measurements confirm this behavior.

Published
2021
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2. Thermodynamic and electronic properties of Dy[Ni.sub.4]Si compound

Author

Falkowski, Michal, Kowalczyk, Andrzej, Reiffers, Marian, Tolinski, Tomasz, Gazo, Emil, Zapotokova, Mariana, and Chelkowska, Grazyna

Subjects
Chemical compounds -- Thermal properties, Chemical compounds -- Electric properties, Chemical compounds -- Magnetic properties, Magnetic fields -- Analysis, Magnetic materials -- Thermal properties, Magnetic materials -- Electric properties, Magnetic materials -- Magnetic properties, X-ray spectroscopy -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

Electronic and thermodynamic properties of the ternary Dy[Ni.sub.4]Si compound, crystallizing in the hexagonal Ca[Cu.sub.5] structure (P6/mmm space group) were studied by X-ray photoelectron spectroscopy (XPS) and heat capacity measurements. Dy[Ni.sub.4]Si is ferromagnetic with magnetic moment 7.9 [micro]B/f.u. at 4.2 K (in H = 9 T) and Curie temperature [T.sub.C] = 11 K. The heat capacity measurements have shown that Dy[Ni.sub.4]Si is characterized by electronic heat capacity coefficient [gamma] = 72 mJ/mol K. Zero field heat capacity reveals a peak close to the magnetic ordering temperature, which gets suppressed in an applied field of 5 T. The valence band of the XPS spectra is determined mainly by the Ni(3d) and Dy(4f) contributions. The slight shift of peaks' positions towards the higher binding energy by about 0.3 eV in respect to the pure Dy is probably due to the different crystalline electric field for Dy in the Dy[Ni.sub.4]Si compound. Index Terms--Ferromagnetic materials, magnetic field effects, transition metal alloys, X-ray spectroscopy.

Published
2008

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