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Single Impurity Effect on the Electron—Hole T‐Matrix in Gadolinium
Author(s) -
Holz A.
Publication year - 1973
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.2220580123
Subject(s) - gadolinium , impurity , condensed matter physics , electrical resistivity and conductivity , coulomb , electron , matrix (chemical analysis) , ion , chemistry , atomic physics , materials science , physics , quantum mechanics , organic chemistry , chromatography
An interpretation of the large 15 μΩcm per at% residual electrical resistivity of Mg in a Gd host is suggested in terms of the formation of bound interband electron—hole states at the Mg site. The theory is developed for a single Mg ion in a Gd host and allows a qualitatively correct interpretation of the experiments. According to an order of magnitude estimate an instability of the paramagnetic ground state in the presence of a single Mg ion seems to be possible when band structure effects on the screening of the Coulomb interaction are taken qualitatively into account.