Spin waves in a doped antiferromagnet

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The authors have studied the doped antiferromagnet using a generalized t-J model which permits a semi-classical expansion about a magnetically ordered ground state. Of particular interest is the interplay between the spin backflow associated with holes and the coherent spin flow of the ordered magnet. A calculation of the leading-order spin-wave spectrum reveals a strong damping effect of the paramagnetic spin currents which, for small doping, renormalizes long-wavelength spin waves and causes short-wavelength spin waves to decay into particle-hole pair excitations. A correct Goldstone mode structure for the spin-wave spectrum is obtained only when the spin backflow is properly taken into account.

Original languageEnglish (US)
Article number015
Pages (from-to)3537-3550
Number of pages14
JournalJournal of Physics: Condensed Matter
Issue number20
StatePublished - Dec 1 1991

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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