Symmetry Does Not Allow Canting of Spins in La_{1.4}Sr_{1.6}Mn_2O_7

Fan Zhong, Z. D. Wang

We analyze the symmetry of all possible magnetic structures of bilayered manganites La_{2-2x}Sr_{1+2x}Mn_2O_7 with doping 0.3 <= x < 0.5 and formulate a corresponding Landau theory…