Spin-wave excitation in the antiferromagnetic bilayer ruthenate Ca 3Ru2O7

X. Ke, Tao Hong, J. Peng, S. E. Nagler, G. E. Granroth, M. D. Lumsden, Z. Q. Mao

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Abstract

We study the spin-wave excitation spectrum of the antiferromagnetic bilayer ruthenate Ca3Ru2O7 through inelastic neutron scattering measurements. The material behaves as a quasi-two-dimensional ferromagnetic bilayer system with very weak interbilayer antiferromagnetic coupling, and its magnetic dispersion can be well described with a nearest-neighbor Heisenberg model. We find that the intrabilayer exchange interaction along the out-of-plane c-axis is much stronger than the in-plane intralayer interaction, in sharp contrast to the previously reported bilayer manganite system. And our study reveals a finite lifetime effect of the magnetic excitation, presumably attributable to the existence of a small number of itinerant charge carriers within the planes.

Original languageEnglish (US)
Article number014422
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number1
DOIs
StatePublished - Jul 11 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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