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||Local density of states in amorphous Ni-P alloys
||J. Phys.: Condens. Matter
||The electronic density of states around the P and Ni atoms in
amorphous alloys Ni(x) P(1-x) for different x
(0.08 < x < 0.26) is investigated using x ray emission. The Ni
d band of the alloy is shifted to higher binding energies by
0.2 eV with respect to that of the pure Ni. The P 3s band
becomes more localized and strongly bonded at a binding energy
of -13.1 eV. The P 3p band is hybridized with the Ni d band and
form bonding and antibonding bands. The antibonding p band is
located at +6.4 eV above the Fermi level, whereas the bonding p
band is at -5.9 eV. The d densities of states around the P atoms
show special features with respect to those in pure P. These new
P d states (at -2.5 eV binding energy, including 0.3 d
electrons) come from Ni d states. An amount of 0.3 - 0.4
electrons (per P atom) is transferred from the Ni atoms to P.
This charge transfer corresponds to 0.1 electron per Ni atom.
The experimental results have been confirmed by two types of
local density calculation using either a cluster approximation
or an infinite periodic lattice model where a definite number of
Ni atoms are substituted by P inpurities. Both computational
methods characterize well the measured local and partial density
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