
TY  - JOUR
A1  - Rossell, HJ 
A1  - Goodman, P 
A1  - Bulcock, S 
A1  - March, RH 
A1  - Kennedy, SJ 
A1  - White, TJ 
A1  - Lincoln, FJ 
A1  - Murray, KS 
T1  - 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>
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1996
VL  - 49
IS  - 2
SP  - 205
EP  - 217
KW  - 
UR  - https://doi.org/10.1071/CH9960205 
N2  - 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. 
ER  -

