TY - JOUR
T1 - Mössbauer study of ferromagnetic phase transitions in (Pd1-xAgx)0.99Fe0.01 alloys
AU - Levy, R. A.
AU - Burton, J. J.
AU - Paul, D. I.
AU - Budnick, J. I.
PY - 1974
Y1 - 1974
N2 - The effect of varying the host-matrix susceptibility of the Pd0.99Fe0.01 alloy system has been investigated through Mössbauer analysis of several (Pd1-xAgx)0.99Fe0.01 alloys with silver concentrations given by x=0, 0.005, 0.025, 0.10, 0.25, and 0.50. We have shown that the Curie temperature varies linearly with the spin paramagnetic susceptibility of the Pd-Ag host matrix, in agreement with theoretical predictions. This was done for silver concentrations up to 25 at.% and assumes a constant value for the spin of the iron impurity. From the observed linear dependence of the ordering temperature on the host-matrix susceptibility evaluated at Tc, we obtain a value for the exchange parameter of 0.11 0.01 eV which is used in estimating the saturation moment per iron atom. Assuming a molecular-field model, values for the saturation hyperfine field are deduced from temperature-extrapolated hyperfine-field measurements. Changes in those values with silver addition suggest changes in the polarization of 3d electrons and a possible correlation with the saturation magnetization. Isomer-shift measurements of these alloys are found to be concentration independent up to x=0.25 and to increase by 20% at about x=0.50.
AB - The effect of varying the host-matrix susceptibility of the Pd0.99Fe0.01 alloy system has been investigated through Mössbauer analysis of several (Pd1-xAgx)0.99Fe0.01 alloys with silver concentrations given by x=0, 0.005, 0.025, 0.10, 0.25, and 0.50. We have shown that the Curie temperature varies linearly with the spin paramagnetic susceptibility of the Pd-Ag host matrix, in agreement with theoretical predictions. This was done for silver concentrations up to 25 at.% and assumes a constant value for the spin of the iron impurity. From the observed linear dependence of the ordering temperature on the host-matrix susceptibility evaluated at Tc, we obtain a value for the exchange parameter of 0.11 0.01 eV which is used in estimating the saturation moment per iron atom. Assuming a molecular-field model, values for the saturation hyperfine field are deduced from temperature-extrapolated hyperfine-field measurements. Changes in those values with silver addition suggest changes in the polarization of 3d electrons and a possible correlation with the saturation magnetization. Isomer-shift measurements of these alloys are found to be concentration independent up to x=0.25 and to increase by 20% at about x=0.50.
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U2 - 10.1103/PhysRevB.9.1085
DO - 10.1103/PhysRevB.9.1085
M3 - Article
AN - SCOPUS:33748122937
VL - 9
SP - 1085
EP - 1091
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 3
ER -