Neutron scattering studies on magnetic structure of the double-layered manganite La2-2xSr1+2xMn2O7 (0.30 ≤ x ≤ 0.50)

Systematic powder diffraction studies have been carried out to establish the magnetic phase diagram of La2-2xSr1+2xMn2O7 (LSMO327) in a wide hole concentration range (0.30 less than or equal to x less than or equal to 0.50), using the HERMES diffractometer. LSM0327 exhibits a planar ferromagnetic structure for 0.32 less than or equal to x less than or equal to 0.38 at low temperatures. A finite canting angle between planar magnetic moments on neighboring planes starts appearing around x similar to 0.40 and reaches 180 degrees (A-type antiferromagnet) at x = 0.48. At x = 0.30, on the contrary, the magnetic moments are aligned parallel to the c-axis. (C) 1999 Elsevier Science Ltd. All rights reserved.