Spin-polarized energy-band structure, conduction-electron polarization, spin densities, and the neutron magnetic form factor of ferromagnetic gadolinium

1974 ◽  
Vol 10 (5) ◽  
pp. 1979-1993 ◽  
Author(s):  
B. N. Harmon ◽  
A. J. Freeman
Keyword(s):  
Form Factor ◽  
Band Structure ◽  
Conduction Electron ◽  
Energy Band ◽  
Magnetic Form Factor ◽  
Energy Band Structure ◽  
Electron Polarization ◽  
Spin Polarized ◽  
Neutron Magnetic Form Factor ◽  
Spin Densities

scholarly journals Spin Polarized Energy Band Structure, Spin Densities and the Neutron Magnetic Form Factor of Gadolinium Metal

1973 ◽  
Author(s):  
B. N. Harmon ◽  
A. J. Freeman ◽  
Hugh C. Wolfe ◽  
C. D. Graham ◽  
J. J. Rhyne
Keyword(s):  
Form Factor ◽  
Band Structure ◽  
Energy Band ◽  
Magnetic Form Factor ◽  
Energy Band Structure ◽  
Spin Polarized ◽  
Neutron Magnetic Form Factor ◽  
Spin Densities

Spin-polarized energy-band structure of YCo5, SmCo5, and GdCo5

1977 ◽  
Vol 16 (3) ◽  
pp. 1242-1248 ◽  
Author(s):  
S. K. Malik ◽  
F. J. Arlinghaus ◽  
W. E. Wallace
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Energy Band Structure ◽  
Spin Polarized

Magnetic form factor Kondo systems: Kondo moment reduction versus conduction electron polarization

1995 ◽  
Vol 206-207 ◽  
pp. 144-146 ◽  
Author(s):  
E. Pavarini ◽  
L.C. Andreani ◽  
G. Amoretti
Keyword(s):  
Form Factor ◽  
Conduction Electron ◽  
Magnetic Form Factor ◽  
Electron Polarization ◽  
Kondo Systems

Calculation of the spin-polarized energy-band structure of LaNi5and GdNi5

1982 ◽  
Vol 25 (10) ◽  
pp. 6488-6491 ◽  
Author(s):  
S. K. Malik ◽  
F. J. Arlinghaus ◽  
W. E. Wallace
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Energy Band Structure ◽  
Spin Polarized

Spin‐Polarized Energy‐Band Structure of Antiferromagnetic MnO

1969 ◽  
Vol 40 (3) ◽  
pp. 1588-1589 ◽  
Author(s):  
Timothy M. Wilson
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Energy Band Structure ◽  
Spin Polarized

Spin polarized energy band structure of SmCo<inf>5</inf>

1974 ◽  
Vol 10 (3) ◽  
pp. 726-728 ◽  
Author(s):  
F. Arlinghaus
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Energy Band Structure ◽  
Spin Polarized

Spin-Polarized Electronic Energy-Band Structure in EuS

1967 ◽  
Vol 157 (3) ◽  
pp. 632-640 ◽  
Author(s):  
S. J. Cho
Keyword(s):  
Band Structure ◽  
Energy Band ◽  
Electronic Energy ◽  
Energy Band Structure ◽  
Spin Polarized ◽  
Electronic Energy Band

THEORY OF THE MAGNETIC FORM FACTOR IN REDUCED-MOMENT KONDO SYSTEMS

1996 ◽  
Vol 10 (10) ◽  
pp. 1167-1189 ◽  
Author(s):  
EVA PAVARINI ◽  
LUCIO CLAUDIO ANDREANI ◽  
GIUSEPPE AMORETTI
Keyword(s):  
Form Factor ◽  
Conduction Electron ◽  
Kondo Effect ◽  
Spin Fluctuation ◽  
Magnetic Form Factor ◽  
Variational Calculation ◽  
Electron Polarization ◽  
Kondo Systems ◽  
Electron Contribution ◽  
The One

The magnetic form factor in Kondo systems, as measured by polarized neutron elastic scattering, is uniformly reduced (with respect to the atomic form factor in the crystal field) due to the Kondo effect, and moreover it shows deviations at small scattering vector due to a spin polarization of conduction electrons: the sign of the deviations in Ce compounds is positive, which is opposite to what is observed in normal rare earths of the first half of the series, and expected from the s-f exchange Hamiltonian. In the present work the above two anomalies are interpreted within a theory for the magnetic form factor in Kondo systems. The uniform reduction of the form factor follows from a variational calculation for the one-impurity Anderson model in an effective magnetic field: Kondo reduction of the localized moment is distinguished here from the presence of a screening cloud, which cannot be observed by neutron scattering. The conduction electron polarization is first studied for the Coqblin-Schrieffer Hamiltonian, which we find to lead again to negative deviations of the form factor. Within the Anderson impurity model, the conduction electron contribution to the form factor is found to be the sum of two terms: a negative RKKY-like polarization, and a positive superexchange term, which is nonzero even for a filled (or empty) band. Dominance of the superexchange polarization could explain the observed sign of the deviations in Ce compounds. A variational basis which describes both Kondo reduction and conduction electron polarization effects is studied: the two effects are clearly separated, since they appear in different orders of the calculations. The conduction electron polarization is shown to be reduced due to the Kondo effect by the same spin-fluctuation factor which reduces the localized moment.

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