Observation of Orbital Currents in CuO

Scagnoli, V.; Staub, U.; Bodenthin, Y.; Souza, R. A. de; García-Fernández, Mirian; Garganourakis, M.; Boothroyd, A. T.; Prabhakaran, D.; Lovesey, S. W.

doi:10.1126/science.1201061

Cited by 125 publications

(130 citation statements)

References 16 publications

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“…Therefore, critical difference of the optical response from this work suggests that the character of the optical ME effect strongly depends on their microscopic mechanism beyond simple estimation based on the symmetry. The ME effect implies the possible toroidal moment or its excitation, which stems from the spin orders or orbital currents in some cases 42,43 . The electromagnon observed here may be viewed as the excitation of the toroidal moment, because the toroidal moment is always anticipated under the presence of the crosscoupled DP x and DM x , that is, the dynamical ME effect 21,33 .…”

Section: Discussionmentioning

confidence: 99%

Magnetochiral dichroism resonant with electromagnons in a helimagnet

et al. 2014

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Cross-coupling between magnetism and electricity in a solid can be hosted by multiferroics with both magnetic and ferroelectric orders. In multiferroics, the collective spin excitations active for both electric and magnetic fields, termed electromagnons, play a crucial role in the elementary process of magnetoelectric (ME) coupling. Here we report the colossal dynamical (optical) ME effect, or more specifically the magnetochiral (MCh) effect, in the electromagnon resonance for the screw spin helimagnet CuFe 1 À x Ga x O 2 (x ¼ 0.035). The MCh effect shows up as the nonreciprocal directional dichroism; the extinction coefficient is different for counter-propagating lights, as large as by 400%. The MCh effect derived from the screw spin order is proved by control of the magnetic helicity of helimagnetism and its magnetization. The results point to the general presence of the MCh effect in helimagnets, paving a way to the ME control of electromagnetic wave in the giga-to tera-hertz region.

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Section: Discussionmentioning

confidence: 99%

Magnetochiral dichroism resonant with electromagnons in a helimagnet

et al. 2014

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“…Materials whose orbitals possess neither symmetry are said to be magnetoelectric as they play a major role in magnetoelectric phenomena. Of particular interest are toroidal moments, corresponding to time-and parity-odd vectors, that not only play a vital role in magnetoelectric phenomena (Spaldin et al, 2008) but have been suggested to be implicated in high-T c superconductivity (Scagnoli et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

On the possibility of using X-ray Compton scattering to study magnetoelectrical properties of crystals

Collins

Laundy

Connolley

et al. 2016

Acta Crystallogr A Found Adv

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This paper discusses the possibility of using Compton scattering -an inelastic X-ray scattering process that yields a projection of the electron momentum density -to probe magnetoelectrical properties. It is shown that an antisymmetric component of the momentum density is a unique fingerprint of such time-and parity-odd physics. It is argued that polar ferromagnets are ideal candidates to demonstrate this phenomenon and the first experimental results are shown, on a single-domain crystal of GaFeO 3 . The measured antisymmetric Compton profile is very small (' 10 À5 of the symmetric part) and of the same order of magnitude as the statistical errors. Relativistic first-principles simulations of the antisymmetric Compton profile are presented and it is shown that, while the effect is indeed predicted by theory, and scales with the size of the valence spin-orbit interaction, its magnitude is significantly overestimated. The paper outlines some important constraints on the properties of the antisymmetric Compton profile arising from the underlying crystallographic symmetry of the sample.

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“…The study of magnetism in this simple model compound can also have important implications for the understanding of high-temperature superconductors, to which CuO is chemically and structurally related. An experiment performed at the ESRF and at the Swiss Light Source by Scagnoli et al [41], but with a crucial theory contribution from Diamond scientists, seems to show evidence of such a link. Scagnoli et al used resonant X-ray diffraction to observe the so-called orbital currents in a copper-oxygen plaquette, the basic building block of cuprate superconductors.…”

Section: (C) Type II Multiferroicsmentioning

confidence: 99%

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

Radaelli

Dhesi

2015

Phil. Trans. R. Soc. A.

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We review some of the significant contributions to the field of strongly correlated materials and complex magnets, arising from experiments performed at the Diamond Light Source (Harwell Science and Innovation Campus, Didcot, UK) during the first few years of operation (2007–2014). We provide a comprehensive overview of Diamond research on topological insulators, multiferroics, complex oxides and magnetic nanostructures. Several experiments on ultrafast dynamics, magnetic imaging, photoemission electron microscopy, soft X-ray holography and resonant magnetic hard and soft X-ray scattering are described.

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Observation of Orbital Currents in CuO

Cited by 125 publications

References 16 publications

Magnetochiral dichroism resonant with electromagnons in a helimagnet

Magnetochiral dichroism resonant with electromagnons in a helimagnet

On the possibility of using X-ray Compton scattering to study magnetoelectrical properties of crystals

The contribution of Diamond Light Source to the study of strongly correlated electron systems and complex magnetic structures

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