d-f Coulomb and quadrupole-strain interactions in DyB{sub 2}C{sub 2} observed by resonant x-ray scattering
- Department of Physics, Graduate School of Science, Tohoku University, Sendai, 980-8578 (Japan)
- Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Kashiwa, 277-8581 (Japan)
- Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, 305-0801 (Japan)
Experimental evidence of the d-f Coulomb interaction responsible for the resonant x-ray scattering (RXS) from antiferroquadrupolar order in DyB{sub 2}C{sub 2} is presented. The energy dependences of the RXS intensity with polarization analysis are analyzed by considering the interference between the resonances of dipolar (E1) and quadrupolar (E2) transition processes. It is found that the structure factors for the E1 and E2 processes have the same sign for {sigma}-{pi}{sup '} but the opposite sign for {sigma}-{sigma}{sup '} channel. This result, when compared to the calculated structure factors, means that the quadrupolar moments of the 4f and 5d shells have opposite signs to each other. Interference between nonresonant Thomson scattering from the lattice distortion and resonant scatterings is also studied, revealing the relation between the displacements of the B and C atoms and the charge distributions of the 4f and 5d shells.
- OSTI ID:
- 20665012
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 71, Issue 1; Other Information: DOI: 10.1103/PhysRevB.71.012405; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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