Orphan spins in the S = 5/2 antiferromagnet CaFe2O4

Stock, C. and Rodriguez, E. E. and Lee, N. and Demmel, F. and Fouquet, P. and Laver, M. and Niedermayer, Ch. and Su, Y. and Nemkovski, K. and Green, M.A. and Rodriguez-Rivera, J. A. and Kim, J. W. and Zhang, L. and Cheong, S. -W. (2017) Orphan spins in the S = 5/2 antiferromagnet CaFe2O4. Physical Review Letters, 119 (25). ISSN 0031-9007. E-ISSN 1079-7114. (doi:https://doi.org/10.1103/PhysRevLett.119.257204) (Full text available)

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Abstract

CaFe2O4 is an anisotropic S=5/2 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.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Mark Green
Date Deposited: 14 Nov 2017 08:58 UTC
Last Modified: 19 Jan 2018 16:06 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/64376 (The current URI for this page, for reference purposes)
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