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Phys. Rev. B 76, 195118 (2007) [6 pages]

Disentangling multipole resonances through a full x-ray polarization analysis

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C. Mazzoli1, S. B. Wilkins1,2, S. Di Matteo3,4, B. Detlefs1,5, C. Detlefs1, V. Scagnoli1, L. Paolasini1, and P. Ghigna6
1European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9, France
2Brookhaven National Laboratory, Condensed Matter Physics & Materials Science Department, Upton, New York, 11973-5000, USA
3Laboratori Nazionali di Frascati INFN, via E. Fermi 40, C.P. 13, I-00044 Frascati (Roma), Italy
4Equipe de physique des surfaces et interfaces, UMR-CNRS 6627 PALMS, Université de Rennes 1, 35042 Rennes Cedex, France
5European Commission, JRC, Institute for Transuranium Elements, Postfach 2340, Karlsruhe, D-76125 Germany
6Dipartimento di Chimica Fisica “M. Rolla,” Universitá di Pavia, I-27100 Pavia, Italy

Received 2 July 2007; published 20 November 2007

Complete polarization analysis applied to resonant x-ray scattering at the Cr K edge in K2CrO4 shows that incident linearly polarized x rays can be converted into circularly polarized x rays by diffraction at the Cr pre-edge (E=5994 eV). The physical mechanism behind this phenomenon is a subtle interference effect between purely dipole (E1-E1) and purely quadrupole (E2-E2) transitions, leading to a phase shift between the respective scattering amplitudes. This effect may be exploited to disentangle two close-lying resonances that appear as a single peak in a conventional energy scan, in this way allowing one to single out and identify the different multipole order parameters involved.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.195118
DOI:
10.1103/PhysRevB.76.195118
PACS:
78.70.Ck, 78.20.Bh, 78.20.Ek
 
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