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Synthesis, structure, and properties of tetragonal Sr2M3As2O2 (M3=Mn3, Mn2Cu, and MnZn2) compounds containing alternating CuO2-type and FeAs-type layers

R. Nath, V. O. Garlea, A. I. Goldman, and D. C. Johnston
Phys. Rev. B 81, 224513 – Published 15 June 2010

Abstract

Polycrystalline samples of Sr2Mn2CuAs2O2, Sr2Mn3As2O2, and Sr2Zn2MnAs2O2 were synthesized. Their temperature- and applied magnetic field-dependent structural, transport, thermal, and magnetic properties were characterized by means of x-ray and neutron diffraction, electrical resistivity ρ, heat capacity, magnetization, and magnetic susceptibility measurements. These compounds have a body-centered-tetragonal crystal structure (space group I4/mmm) that consists of MO2 (M=Zn and/or Mn) oxide layers similar to the CuO2 layers in high superconducting transition temperature Tc cuprate superconductors, and intermetallic MAs (M=Cu and/or Mn) layers similar to the FeAs layers in high-Tc pnictides. These two types of layers alternate along the crystallographic c axis and are separated by Sr atoms. The site occupancies of Mn, Cu, and Zn were studied using Rietveld refinements of x-ray and neutron powder diffraction data. The temperature dependences of ρ suggest metallic character for Sr2Mn2CuAs2O2 and semiconducting character for Sr2Mn3As2O2 and Sr2Zn2MnAs2O2. Sr2Mn2CuAs2O2 is inferred to be a ferrimagnet with a Curie temperature TC=95(1)K. Remarkably, we find that the magnetic ground-state structure changes from a G-type antiferromagnetic structure in Sr2Mn3As2O2 to an A-type ferrimagnetic structure in Sr2Mn2CuAs2O2 in which the Mn ions in each layer are ferromagnetically aligned but are antiferromagnetically aligned between layers.

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  • Received 27 April 2010

DOI:https://doi.org/10.1103/PhysRevB.81.224513

©2010 American Physical Society

Authors & Affiliations

R. Nath1,*, V. O. Garlea2, A. I. Goldman1, and D. C. Johnston1

  • 1Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 2Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *Present address: Indian Institute of Science Education and Research, Thiruvananthapuram-695016, Kerala, India.

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Issue

Vol. 81, Iss. 22 — 1 June 2010

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