Magnetism in La2O3(Fe1-xMnx)2Se2 tuned by Fe/Mn ratio
  We report the evolution of structural and magnetic properties in La2O3(Fe1-xMnx)2Se2. Heat capacity and bulk magnetization indicate an increased ferromagnetic component of the long-range magnetic order and possible increased degree of frustration. Atomic disorder on Fe(Mn) sites suppresses the temperature of the long-range order whereas intermediate alloys show a rich magnetic phase diagram. 
Hechang Lei, Emil S. Bozin, A. Llobet, V. Ivanovski, V. Koteski, J.   Belosevic Cavor, B. Cekic, and C. Petrovic
cond-mat.str-el cond-mat.supr-con