The Crystal and Magnetic Structure of Sr2Mn2CrAs2O2
Manganese oxypnictides such as LnMnAsO1-xFx (Ln = La, Ce, Pr, Nd) exhibit fascinating electronic and magnetic properties such as colossal magnetoresistance (CMR), spin reorientation transitions and semiconductor insulator transitions. We are now investigating more complex Mn oxypnictides in order to reveal their electronic and magnetic properties. We have recently synthesized the new phase Sr2Mn2CrAs2O2. Sr2Mn2CrAs2O2 has a body centered tetragonal crystal structure that consists of MO2 (M=Cr and/or Mn) oxide layers similar to the CuO2 layers in high temperature superconducting cuprate superconductors, and intermetallic MAs (M=Cr and/or Mn) layers similar to the MnAs layers in the oxypnictides described above. SQUID magnetometry measurements show two magnetic transitions below 150 K and 50 K. These transitions most likely arise from magnetic order within the MAs and MO2 layers respectively. In order to determine the crystal and magnetic structures of Sr2Mn2CrAs2O2 below the two magnetic transitions at 150 K and 50 K we request time on the high resolution diffractometer D2B and the high intensity diffractometer D1B.
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MCLAUGHLIN Abbie; LAWRENCE Gaynor; MCCOMBIE Kirstie; RITTER Clemens and WILDMAN Eve. (2018). The Crystal and Magnetic Structure of Sr2Mn2CrAs2O2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2548
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