Orphan Spins in the S = 5 2 Antiferromagnet CaFe 2 O 4

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

doi:10.1103/PhysRevLett.119.257204

Journal Article

FZJ-2018-01473

Orphan Spins in the S = 5 2 Antiferromagnet CaFe 2 O 4

Stock, C. (Corresponding author) ; Rodriguez, E. E. ; Lee, N. ; Demmel, F. ; Fouquet, P. ; Laver, M. ; Niedermayer, C. ; Su, Y.FZJ* ; Nemkovskiy, K.FZJ* ; Green, M. A. ; Rodriguez-Rivera, J. A. ; Kim, J. W. ; Zhang, L.FZJ* ; Cheong, S.-W.

2017
APS College Park, Md.

Physical review letters 119(25), 257204 (2017) [10.1103/PhysRevLett.119.257204]

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Please use a persistent id in citations: http://hdl.handle.net/2128/17497 doi:10.1103/PhysRevLett.119.257204

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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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