DOI: https://doi.org/10.30970/jps.03.458
DEVELOPMENT OF MAGNETISM UNDER HYDROGENATION IN RENiAl–H SYSTEMS
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Journal of Physical Studies 3(4), 458–462 (1999)
DOI: https://doi.org/10.30970/jps.03.458 DEVELOPMENT OF MAGNETISM UNDER HYDROGENATION IN RENiAl–H SYSTEMS |
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A. V. Kolomiets1,2,
L. Havela1,
V. A. Yartys2,
A. V. Andreev1,3
1 Department of Electronic Structures,
Faculty of Mathematics and Physics, Charles University
Ke Karlovu 5, 121 16 Prague 2, The Czech Republic
2 Metal Hydrides Department,
Karpenko Physico-Mechanical Institute of the
National Academy of Sciences of Ukraine
5, Naukova Str., 79601 Lviv, Ukraine
3 Institute of Physics, Academy of Science of the Czech Republic
Na Slovance 2, 180 00 Prague 8, The Czech Republic
The paper is devoted to the study of effect of hydrogenation (deuteration) on magnetic properties of ıt RE}NiAl compounds (ıt RE} = rare–earth atom). It was found that incorporation of hydrogen into the crystal lattice drastically reduces magnetic ordering temperatures in these materials due to modification of the density of electronic states at the Fermi level. Hydrogen differential thermal analysis (HDTA) studies show that hydrogen occupies 2 or 3 different crystallographic positions in the unit cell, which is in agreement with the results of neutron diffraction. Removal of hydrogen from the lattice leads to a non–contionuous recovery of the original magnetic and crystal properties of ıt RE}NiAl.