ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A number of new ternary ferromagnetic compounds have been prepared1 which have the general formula A14MnX11 (A=Ca, Sr and X=As, Sb, or Bi) and are isostructural to the main group Zintl compounds Ca14GaAs11 (Ref. 2) and Ca14AlSb11.3 The Mn-Mn nearest-neighbor distances in these compounds are ≥11 A(ring). Each of the compounds containing Mn is a metallic ferromagnet with a Curie transition in the neighborhood of 40–60 K. From magnetization measurements in the paramagnetic regime it appears that the Mn has a valence of +3 and that there are good local moments associated with the four unpaired electrons. This is in contrast to the low-temperature state in which the ordered ferromagnetic moment is only about 2.5 μB/Mn. Since no structural change is found upon cooling the sample below the Curie temperature and resistivity measurements show a strong interaction between the conduction electrons and the local moments, we suggest that the ferromagnetic moment is reduced by coupling with the conduction electrons.〈ks〉
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.348244
Permalink