
%0 Journal Article
%A Rossell, HJ 
%A Goodman, P 
%A Bulcock, S 
%A March, RH 
%A Kennedy, SJ 
%A White, TJ 
%A Lincoln, FJ 
%A Murray, KS 
%T Structural and Solid-State Examination of Ca<sub>4</sub>Mn<sub>3</sub>O<sub>10</sub> and Sr<sub>4</sub>Mn<sub>3</sub>O<sub>10</sub>
%J Australian Journal of Chemistry
%D 1996/02/01
%V 49
%N 2
%P 205-217
%K 
%R https://doi.org/10.1071/CH9960205
%U https://www.publish.csiro.au/paper/CH9960205 
%X A comparative study of the manganates Ca4Mn3O10 and Sr4Mn3O10 shows them to belong to distinct structural classes, of Ruddlesden-Popper and Cs4Ni3F10 type respectively. Our determinations show both compounds to be orthorhombic, with Ca4Mn3O10 in space group Ccc2, with a = 5.240, b = 26.823, c = 5.276 &#506;, and Sr4Mn3O10 in space group P2221, with the cell dimensions of a = 5.481(1), b = 6.237(1), c = 12.528(2) &#506;. In addition, Ca4Mn3O10 is found to undergo a transition at 122 K, below which temperature there is evidence for antiferromagnetic ordering and for a sharp conductor-to-insulator transition. This appears to be a new form of giant magnetoresistance (GMR), differing from previous reports in that it occurs in an undoped , layered bulk perovskite. 
