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Parity-odd multipoles, magnetic charges, and chirality in hematite α-Fe(2)O(3)
dc.contributor.author | Lovesey, Stephen William | |
dc.contributor.author | Rodríguez Fernández, Adela | |
dc.contributor.author | Blanco Rodríguez, Jesús Ángel | |
dc.date.accessioned | 2013-01-30T10:01:24Z | |
dc.date.available | 2013-01-30T10:01:24Z | |
dc.date.issued | 2011 | |
dc.identifier.citation | Physical Review B, 83(5), 054427(2011); doi:10.1103/PhysRevB.83.054427 | eng |
dc.identifier.issn | 1098-0121 | |
dc.identifier.uri | http://link.aps.org/doi/10.1103/PhysRevB.83.054427 | |
dc.identifier.uri | http://hdl.handle.net/10651/7100 | |
dc.description.abstract | Collinear and canted magnetic motifs in hematite were investigated by J. Kokubun et al. [Phys. Rev. B 78 115112 (2008) using x-ray Bragg diffraction magnified at the iron K-edge, and analyses of observations led to various potentially interesting conclusions. We demonstrate that the reported analyses for both nonresonant and resonant magnetic diffraction at low energies near the absorption K-edge are not appropriate. In its place, we apply a radically different formulation, thoroughly tried and tested, that incorporates all magnetic contributions to resonant x-ray diffraction allowed by the established chemical and magnetic structures. Essential to a correct formulation of diffraction by a magnetic crystal with resonant ions at sites that are not centers of inversion symmetry are parity-odd atomic multipoles, time-even (polar) and time-odd (magneto-electric), that arise from enhancement by the electric-dipole (E1)–electric-quadrupole (E2) event. Analyses of azimuthal-angle scans on two space-group forbidden reflections, hexagonal (0,0,3)h and (0,0,9)h, collected by Kokubun et al. [Phys. Rev. B 78, 115112 (2008)] above and below the Morin temperature (TM=250 K), allow us to obtain good estimates of contributing polar and magnetoelectric multipoles, including the iron anapole. We show, beyond reasonable doubt, that available data are inconsistent with parity-even events only (E1-E1 and E2-E2). For future experiments, we show that chiral states of hematite couple to circular polarization and differentiate E1-E2 and E2-E2 events, while the collinear motif supports magnetic charges. | eng |
dc.language.iso | eng | |
dc.publisher | American Physical Society | |
dc.relation.ispartof | Physical Review B | eng |
dc.rights | © American Physical Society (APS) | |
dc.title | Parity-odd multipoles, magnetic charges, and chirality in hematite α-Fe(2)O(3) | eng |
dc.type | journal article | |
dc.identifier.doi | 10.1103/PhysRevB.83.054427 | |
dc.relation.publisherversion | http://dx.doi.org/10.1103/PhysRevB.83.054427 | |
dc.rights.accessRights | open access |