Orphan Spins in the S= 52 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

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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 (US)
Article number257204
JournalPhysical review letters
Issue number25
StatePublished - Dec 22 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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