Spin waves in the ferromagnetic ground state of the kagome staircase system Co3V2O8


Ramazanoglu M. K., ADAMS C. P., Clancy J. P., BERLINSKY A. J., YAMANI Z., SZYMCZAK R., ...More

PHYSICAL REVIEW B, vol.79, no.2, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 79 Issue: 2
  • Publication Date: 2009
  • Doi Number: 10.1103/physrevb.79.024417
  • Journal Name: PHYSICAL REVIEW B
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Istanbul Technical University Affiliated: No

Abstract

Inelastic neutron-scattering measurements were performed on single-crystal Co3V2O8 wherein magnetic cobalt ions reside on distinct spine and cross-tie sites within kagome staircase planes. This system displays a rich magnetic phase diagram which culminates in a ferromagnetic ground state below T-C similar to 6 K. We have studied the low-lying magnetic excitations in this phase within the kagome plane. Despite the complexity of the system at higher temperatures, linear spin-wave theory describes most of the quantitative detail of the inelastic neutron measurements. Our results show two spin-wave branches, the higher energy of which displays finite spin-wave lifetimes well below T-C, and that, surprisingly, the magnetic exchange coupling between Co moments on the spine sites is negligible.