Field induced magnetic structure transition of LaSrFeO4

We report the spin flop transition on LaSrFeO4. A single crystal of LaSrFeO4 has been prepared by the floating-zone method. The Moessbauer spectrum below 370 K consists of a single Fe3+ hyperfine sextet. We observed a magnetization jump around 1.8 T in the magnetization curve below 20 K. From the analysis of the transition field on [1 0 0] and [1 1 0] direction, we found the magnetization jump corresponds to the spin flop transition in the antiferromagnetic ground state of [1 1 0] and [-1 1 0] spin direction in the c plane