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Orphan spins and bound in-gap states in the $S={5\over2}$ antiferromagnet CaFe$_{2}$O$_{4}$
- Source :
- Phys. Rev. Lett. 119, 257204 (2017)
- Publication Year :
- 2017
-
Abstract
- CaFe$_{2}$O$_{4}$ is an anisotropic $S={5\over 2}$ antiferromagnet with two competing $A$ ($\uparrow \uparrow \downarrow \downarrow$) and $B$ ($\uparrow \downarrow \uparrow \downarrow$) 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 CaFe$_{2}$O$_{4}$.<br />Comment: (main text - 5 pages, 4 figures; supplementary information - 4 pages, 6 figures, to be published in Physical Review Letters). arXiv admin note: text overlap with arXiv:1606.04243
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 119, 257204 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1712.02853
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.119.257204