High pressure high temperature (HPHT) synthesis and magnetism of   MSr2Y1.5Ce0.5Cu2O10 compounds with M = Ru, Mn, and Cr
  The M-1222 compounds are synthesized in near single phase form. These compounds crystallise in I4/mmm Tetragonal structure. None of the studied compound is superconducting but they asre weakly magnetic. This is first report on synthesis of Cr and Mn -1222 compounds. These compounds are synthesized at ultra conditions of HPHT that is the 6 Gpa and 1400 C. 
V.P.S. Awana (NPL+NIMS), S. Balamurugan (NIMS), H. Kishan (NPL), and   E. Takayama-Muromachi (NIMS)