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Experimental Evidence for Interband Mixing in Rare‐Earth Intermetallic Compounds
Author(s) -
de Wijn H. W.,
Buschow K. H. J.,
van Diepen A. M.
Publication year - 1968
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.19680300236
Subject(s) - intermetallic , condensed matter physics , spins , curie temperature , rkky interaction , paramagnetism , curie , knight shift , exchange interaction , chemistry , antiferromagnetism , mixing (physics) , electron , ferromagnetism , physics , superconductivity , quantum mechanics , organic chemistry , alloy
Measurements of the Knight shifts and susceptibilities of rare‐earth intermetallic compounds have been extended to YCu, GdCu, TbCu, DyCu, HoCu, and ErCu. The phenomenological exchange constants sf between 4f‐electron spins and conduction‐electron spins are derived to be −0.21 eV. Also the paramagnetic Curie temperatures of the compounds GdCu 1− x Ga x have been measured. The Knight shifts and Curie temperatures are discussed in terms of the Ruderman‐Kittel‐Kasuya‐Yosida theory. For the various series of rare‐earth intermetallic compounds the s‐f exchange integral Γ = 2 J (0) and the Fermi wave vector k F have been determined. Γ is found to be a continuous function of k F , with a sign reversal at k F ≈ 1.4 Å −1 . This observed behavior is consistent with the calculations of Watson, Koide, Peter, and Freeman on the effect of interband mixing on the exchange interactions.