Abstract
The effective diagonal-exchange parameter Jeff(0) which determines the exchange splitting of a metal's Fermi-surface conduction electrons, has been investigated with a model involving simple orthogonalized-plane-wave conduction-electron orbitals and rare-earth ion cores. The positive exchange integral and negative interband mixing contributions to Jeff(0) have been estimated for the rare earths as a function of nuclear charge Z. The results indicate that interband mixing may dominate, causing a net negative conduction-electron polarization, in agreement with a number of experiments. The interband mixing, and hence the sign of Jeff(0), is found to be very sensitive to conduction-electron character. The results also indicate that, for ions other than spherical Gd, the parameter Jeff(0) will vary strongly with conduction-electron k direction (with respect to the J of the rare-earth ion) and may even involve a variation in sign. Such anisotropies in Jeff(0) and the nondiagonal Jeff(Q) parameters should be a significant source of anisotropies in the Ruderman-Kittel-Kasuya-Yosida conduction-electron spin distribution.
| Original language | English |
|---|---|
| Journal | Physical Review |
| Volume | 139 |
| Issue number | 1A |
| DOIs | |
| Publication status | Published - 1965 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Effective conduction-electron-local-moment exchange interaction in metals : Rare-earth interband mixing. / Watson, R. E.; Koide, S.; Peter, M.; Freeman, Arthur J.
In: Physical Review, Vol. 139, No. 1A, 1965.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effective conduction-electron-local-moment exchange interaction in metals
T2 - Rare-earth interband mixing
AU - Watson, R. E.
AU - Koide, S.
AU - Peter, M.
AU - Freeman, Arthur J
PY - 1965
Y1 - 1965
N2 - The effective diagonal-exchange parameter Jeff(0) which determines the exchange splitting of a metal's Fermi-surface conduction electrons, has been investigated with a model involving simple orthogonalized-plane-wave conduction-electron orbitals and rare-earth ion cores. The positive exchange integral and negative interband mixing contributions to Jeff(0) have been estimated for the rare earths as a function of nuclear charge Z. The results indicate that interband mixing may dominate, causing a net negative conduction-electron polarization, in agreement with a number of experiments. The interband mixing, and hence the sign of Jeff(0), is found to be very sensitive to conduction-electron character. The results also indicate that, for ions other than spherical Gd, the parameter Jeff(0) will vary strongly with conduction-electron k direction (with respect to the J of the rare-earth ion) and may even involve a variation in sign. Such anisotropies in Jeff(0) and the nondiagonal Jeff(Q) parameters should be a significant source of anisotropies in the Ruderman-Kittel-Kasuya-Yosida conduction-electron spin distribution.
AB - The effective diagonal-exchange parameter Jeff(0) which determines the exchange splitting of a metal's Fermi-surface conduction electrons, has been investigated with a model involving simple orthogonalized-plane-wave conduction-electron orbitals and rare-earth ion cores. The positive exchange integral and negative interband mixing contributions to Jeff(0) have been estimated for the rare earths as a function of nuclear charge Z. The results indicate that interband mixing may dominate, causing a net negative conduction-electron polarization, in agreement with a number of experiments. The interband mixing, and hence the sign of Jeff(0), is found to be very sensitive to conduction-electron character. The results also indicate that, for ions other than spherical Gd, the parameter Jeff(0) will vary strongly with conduction-electron k direction (with respect to the J of the rare-earth ion) and may even involve a variation in sign. Such anisotropies in Jeff(0) and the nondiagonal Jeff(Q) parameters should be a significant source of anisotropies in the Ruderman-Kittel-Kasuya-Yosida conduction-electron spin distribution.
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U2 - 10.1103/PhysRev.139.A167
DO - 10.1103/PhysRev.139.A167
M3 - Article
VL - 139
JO - Physical Review
JF - Physical Review
SN - 0031-899X
IS - 1A
ER -