# Orphan spins in the $$S = {5 \over 2}$$ antiferromagnet $$CaFe_2O_4$$

Stock, C., Rodriguez, E. E., Lee, N., Demmel, F., Fouquet, P., Laver, M., Niedermayer, Ch., Su, Y., Nemkovski, K., Green, M.A., and others. (2017) Orphan spins in the $$S = {5 \over 2}$$ antiferromagnet $$CaFe_2O_4$$. Physical Review Letters, 119 (25). Article Number 257204. ISSN 0031-9007. E-ISSN 1079-7114. (doi:10.1103/PhysRevLett.119.257204) (KAR id:64376)

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## Abstract

$$CaFe_2O_4$$ 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 $$CaFe_2O_4$$.

Item Type: Article 10.1103/PhysRevLett.119.257204 Q Science Divisions > Division of Natural Sciences > School of Physical Sciences Mark Green 14 Nov 2017 08:58 UTC 16 Feb 2021 13:50 UTC https://kar.kent.ac.uk/id/eprint/64376 (The current URI for this page, for reference purposes) https://orcid.org/0000-0002-7886-6205