Orphan Spins in the S=5/2 Antiferromagnet CaFe2O4

C. Stock, E. E. Rodriguez, N. Lee, F. Demmel, P. Fouquet, M. Laver, Ch. Niedermayer, Y. Su, K. Nemkovski, M. A. Green, J. A. Rodriguez-Rivera, J. W. Kim, L. Zhang, S. -W. Cheong

Research output: Contribution to journalArticlepeer-review

Abstract

CaFe2O4 is an anisotropic S=52 antiferromagnet with two competing A (↑↑↓↓) and B (↑↓↑↓) magnetic order parameters separated by static antiphase boundaries at low temperatures. Neutron diffraction and bulk susceptibility measurements, show that the spins near these boundaries are weakly correlated and a carry an uncompensated ferromagnetic moment that can be tuned with a magnetic field. Spectroscopic measurements find these spins are bound with excitation energies less than the bulk magnetic spin waves and resemble the spectra from isolated spin clusters. Localized bound orphaned spins separate the two competing magnetic order parameters in CaFe2O4.

Original languageEnglish
Article number257204
Number of pages6
JournalPhysical Review Letters
Volume119
Issue number25
DOIs
Publication statusPublished - 22 Dec 2017

Keywords

  • ELECTRONIC-STRUCTURE
  • MAGNETIC-ANISOTROPY
  • ISOLATED CLUSTERS
  • VORTEX CORE
  • EXCITATIONS
  • STATES
  • SOLITONS
  • IONS

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