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Collective Magnetic Order and Intermediate Valence in the Anderson Model
Author(s) -
Reddy G. Gangadhar,
Ramakanth A.
Publication year - 1986
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.2221380118
Subject(s) - condensed matter physics , valence (chemistry) , lattice constant , curie temperature , phase diagram , electron , physics , conduction band , lattice (music) , phase (matter) , quantum mechanics , ferromagnetism , diffraction , acoustics
The question of the coexistence of long range magnetic order and intermediate valence is investigated using the periodic Anderson model. The average occupation n f of the relatively well localized 4f level and the corresponding magnetization m f are selfconsistently calculated keeping the total number of electrons N per lattice site fixed. The Curie temperature T C is determined following the temperature variation of m f . The behaviour of T C as a function of the position of the localized 4f level E f for a constant Bloch band width W and as a function of W for a constant E f are studied for different values of N . The results are interpreted in terms of the interplay between the relative occupation of the f‐level and the conduction band and the fluctuations caused by the hybridization. Similarities with experimental results are pointed out. A phase diagram is constructed which indicates the constellations of model parameters which permit long range magnetic order.