Disentangling multipole resonances through a full x-ray polarization analysis

Mazzoli, Claudio; Wilkins, S. B.; Matteo, S. Di; Detlefs, Blanka; Detlefs, C.; Scagnoli, V.; Paolasini, L.; Ghigna, Paolo

doi:10.1103/physrevb.76.195118

Cited by 51 publications

(56 citation statements)

References 30 publications

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“…When the azimuthal degree of freedom is not available (e.g., experiments in a magnetic field) or when a sample is prone to have domains, an alternative approach is to keep the sample fixed at a given azimuthal angle and to instead change the direction of the polarization of the incident x rays, the so-called linear polarization scan (or, shortly, polscan). 41 We call ζ the angle that materializes this rotation.…”

Section: Resultsmentioning

confidence: 99%

“…P 0 is proportional to the intensity of the incident x-ray beam. [41][42][43] The linear polarization of the incident photons can be rotated by the use of diamond phase plates 41,43,44 and also circularly polarized light can be produced. 45 The EuTiO 3 single crystal was cut in order to have the [001] direction (as well as the [110] one, given the presence of crystallographic twins, due to the cubic-tetragonal phase transition) perpendicular to the sample surface.…”

Section: Methodsmentioning

confidence: 99%

“…We use P to refer to the polarization state of the incident x rays and P to refer to the polarization state of the diffracted x rays. 41 The polarization analyzer setup can be rotated around the scattered beam by an angle η. At each point the integrated intensity can be determined by rocking the analyzer's θ axis (θ P A ).…”

Section: Methodsmentioning

confidence: 99%

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EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

et al. 2012

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We combine neutron powder diffraction and x-ray single-crystal magnetic diffraction at the Eu L 2 edge to scrutinize the magnetic motif of the Eu ions in magnetoelectric EuTiO 3 . Our measurements are consistent with an antiferromagnetic G-type pattern with the Eu magnetic moments ordering along the a,b -plane diagonal. Recent reports of a novel transition at 2.75 K with a flop of magnetic moments upon poling the sample in an electric field cannot be confirmed for a nonpoled sample. Our neutron diffraction data do not show any significant change of the structure below the Néel temperature. Magnetoelastic coupling, if present, is therefore expected to be negligible.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

et al. 2012

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“…This has commonly been undertaken with soft x-ray polarimetry; 16 however has not been performed in a soft x-ray diffraction setting. Combining polarization analysis of the scattered beam with a rotation of the linear polarized incident x-rays, full linear polarization analysis [61][62][63] can be achieved. The very low x-ray energies force the use of multilayer A complex cable management system was designed to separately carry the motion and detector cables from the back flange of the chamber to the end of the 2 arm.…”

Section: Polarization Analysismentioning

confidence: 99%

RASOR: An advanced instrument for soft x-ray reflectivity and diffraction

Beale

Hase

Iida

et al. 2010

Review of Scientific Instruments

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. (2010) 'RASOR : an advanced instrument for soft x-ray re ectivity and di raction.', Review of scienti c instruments., 81 (7). 073904.Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report the design and construction of a novel soft x-ray diffractometer installed at Diamond Light Source. The beamline endstation RASOR is constructed for general users and designed primarily for the study of single crystal diffraction and thin film reflectivity. The instrument is comprised of a limited three circle ͑ , 2 , and ͒ diffractometer with an additional removable rotation ͑ ͒ stage. It is equipped with a liquid helium cryostat, and post-scatter polarization analysis. Motorized motions are provided for the precise positioning of the sample onto the diffractometer center of rotation, and for positioning the center of rotation onto the x-ray beam. The functions of the instrument have been tested at Diamond Light Source, and initial test measurements are provided, demonstrating the potential of the instrument.

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“…In this way, we can obtain the Stokes parameters for the secondary beam as a function of both incident and scattered linear polarization angle, without moving the crystal. This method can elucidate the presence of resonances that are very close in energy, playing on their relative phase shifts [16]. Experiments were carried out at the ID20 beamline [17] of the ESRF.…”

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confidence: 99%

Experimental evidence of anapolar moments in the antiferromagnetic insulating phase ofV2O3obtained from x-ray resonant Bragg diffraction

et al. 2010

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We have investigated the antiferromagnetic insulating phase of the Mott-Hubbard insulator V 2 O 3 by resonant x-ray Bragg diffraction at the vanadium K-edge. Combining the information obtained from azimuthal angle scans, linear incoming polarization scans and by fitting collected data to the scattering amplitude derived from the established chemical I2/a and magnetic space groups we provide evidence of the ordering motif of anapolar moments (which results from parity violation coupling to an electromagnetic field). Experimental data (azimuthal dependence and polarization analysis) collected at space-group forbidden Bragg reflections are successfully accounted within our model in terms of vanadium magnetoelectric multipoles. We demonstrate that resonant x-ray diffraction intensities in all space-group forbidden Bragg reflections of the kind (hkl) m with odd h are produced by an E1-E2 event. The determined tensorial parameters offer a test for ab-initio calculations in this material, that can lead to a deeper and more quantitative understanding of the physical properties of V 2 O 3 .

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Disentangling multipole resonances through a full x-ray polarization analysis

Cited by 51 publications

References 30 publications

EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

EuTiO3magnetic structure studied by neutron powder diffraction and resonant x-ray scattering

RASOR: An advanced instrument for soft x-ray reflectivity and diffraction

Experimental evidence of anapolar moments in the antiferromagnetic insulating phase ofV2O3obtained from x-ray resonant Bragg diffraction

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