X-ray photoelectron spectroscopy and magnetic properties of CeCo7Mn5 and CeCo8Mn4 isostructural ThMn12 type compounds

XPS on Gd1−xCexCo2 Intermetallic Compounds

“…In the lower binding energy region, between 100 and 110 eV, the peaks corresponding to trivalent Ce are superimposed on the Co 3s peaks, while the peaks at higher binding energies, situated at about 119 and 122.5 eV, correspond to the fraction of tetravalent Ce in the compound. The spin‐orbit splittings for Ce 4+ are around 3.4 ± 0.1 eV in all investigated samples, in good agreement with the values measured in other mixed valence compounds, such as CeNi 2 , CeNi 5 , CeF 4 , Ce 2 Co 15 Mn 3 , CeCo 7 Mn 5 , and CeCo 8 Mn 4 …”

Magnetic Behaviour of the Ce-Co-Mn Intermetallics of MgCu2Structure Type

“…Due to the smaller number of Mn atoms in the unit cell, the average distance d Mn−Mn in CeCo 2 Mn 0.33 is much larger than that in the isostructural CeCoMn and CeCoMn 1.33 alloys. 3. Results and discussions Figure 2 shows the temperature dependence of the zero eld cooled (ZFC) magnetization for CeCoMn 1.33 measured in two applied magnetic elds B = 1 T and 2 T. The M (T ) curves exhibit a maximum around 44 K and 35 K, respectively, revealing the antiferromagnetic behavior of CeCoMn 1.33 alloy.…”

“…The nearestneighborhood of Co and Mn atoms, as well as, the Co Co, CoMn, and MnMn distances are dierent in each compound. By combining X-ray photoelectron spectroscopy (XPS) and magnetic measurements, we have shown that in Ce 2 Co 15 Mn 3 (with Th 2 Zn 17 structure type) [2] and CeCo 7 Mn 5 and CeCo 8 Mn 4 (with ThMn 12 structure type) [3] compounds both Co and Mn atoms carry magnetic moments and Ce atoms are in the intermediate valence state. The complex magnetic structure of the three compounds is determined by the competition between the ferromagnetic (CoCo pairs) and antiferromagnetic (CoMn and MnMn pairs) interactions.…”