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Influence of Non‐Magnetic Impurities on the Ferromagnetic Phase Transition and Its Critical Properties
Author(s) -
Fazakas A. B.,
Corcoţtoi I.,
Ciobanu G.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221450128
Subject(s) - impurity , ferromagnetism , condensed matter physics , critical exponent , curie temperature , phase transition , physics , quantum mechanics
The free energy functional is derived for an electron gas interacting via insite Hubbard and intersite Heisenberg terms, scattered by some dilute, interstitial, non‐magnetic impurities. The equation for the Curie temperature is deduced and discussed in various approximations. The existence is shown of a critical concentration of impurities destroing the ferromagnetism. The dirty specimen has the same critical exponents as the pure one, but the width of the critical region is modified.