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http://hdl.handle.net/20.500.12128/7004
Tytuł: | On the origin of the heavy-fermion like behavior of the Heusler-type Fe3-xVxM (M = Al, Ga) alloys |
Autor: | Deniszczyk, Józef |
Słowa kluczowe: | heavy fermions; fermions |
Data wydania: | 2001 |
Źródło: | Acta Physica Polonica. B, 2001, no. 2, s. 529-533 |
Abstrakt: | The electronic structure of I-e:> V., M (M=A1, Ga) alloys was investigated
by ab initio method. Magnetic and non-magnetic band structure
of !•'(>:» , \ ,M was calculated for concentrations x = 0.0-1.0. Calculations
have shown that the transition from magnetic to non-magnetic state is accompanied
by the qualitative changes in the band structure in the vicinity
of the Fermi level (ef)- For concentrations 0.5 < x < 1 the Density Of
States (DOS) at £f in both magnetic states display a sharp peak composed
solely of the 3d states of impurity Fe-AS atom ( Fe atom at nominally V
atom position of I-eA’Al Heusler compound). In the magnetic state only
majority-spin states enter the DOS near £p. The quasi-gap around the
ef found in I-'eA’M is filled up by 3df states of Fe-AS which produce the
sharp structures at £p. Transition to the non-magnetic state results in the
narrowing and strengthening of the peak of Fe-AS 3d-states DOS at £f and
the opening of the well-defined gap just above the Fermi level. The changes
of the DOS around £f connected with the variation of Fe-AS concentration
and magnetic transition explain the peculiar behavior of the electrical
resistivity observed experimentally. |
URI: | http://hdl.handle.net/20.500.12128/7004 |
ISSN: | 0587-4254 |
Pojawia się w kolekcji: | Artykuły (WNŚiT)
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