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Observation of complex magnetic behavior in the perovskite rare earth copper oxide systems, R2CuO4

  • Author(s): Oseroff, S
  • Rao, D
  • Wright, F
  • Tovar, M
  • Vier, DC
  • Schultz, S
  • Thompson, JD
  • Fisk, Z
  • Cheong, SW
  • et al.

EPR, microwave absorption, and dc magnetization measurements were made on single crystals of the form R CuO , which are the host compounds for the newly discovered series of electron cuprate superconductors. These measurements reveal two characteristic transition temperatures associated with a novel complex magnetic behavior, including weak ferromagnetism, two sharp peaks in the low field DC magnetization, an unusual anisotropy in the EPR resonance field for R = Gd, and two additional anisotropic microwave absorption modes. The higher characteristic transition temperature, at ≈270K, is attributed to AF ordering of the Cu moments, and the lower, at ≤20K, to a spontaneous canted spin reorientation. An understanding of this magnetic behavior is important in order to ascertain its relationship to possible mechanisms of high temperature superconductivity. © 1989. 2 4

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