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Observation of an unusual ESR signal in antiferromagnetic Eu 2CuO4

  • Author(s): Vier, DC
  • Schultz, S
  • Rettori, C
  • Rao, D
  • Oseroff, SB
  • Tovar, M
  • Fisk, Z
  • Cheong, SW
  • et al.

Published Web Location

https://doi.org/10.1063/1.348208Creative Commons Attribution 4.0 International Public License
Abstract

We report the observation of an unusual electron spin resonance (ESR) signal in single crystals of Eu2CuO4. The signal appears to be associated with a resonance mode of the CuO2 planes, similar to the midfield and low-field absorptions we have reported previously [Phys. Rev. B 41, 1934 (1990)]. However, it is only observed when the projection of the applied dc magnetic field in the CuO2 plane is within a few degrees of the 〈110〉 crystallographic direction. Additionally the sample must be field cooled in the CuO2 plane, but with a component of the cooling field perpendicular to the 〈110〉 ESR observation direction. Both the field for resonance and the linewidth exhibit a 1/cos θ dependence, where θ is the angle of the applied dc field between the c axis and the 〈110〉 observation direction. Additional constraints for observation of the resonance are that the microwave rf magnetic field must have a component in the CuO2 plane, but perpendicular to the dc field. The signal disappears above ∼215 K, which we assume is associated with the antiferromagnetic ordering temperature.

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