Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-09-22
Phys. Rev. B 71, 012405 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages
Scientific paper
10.1103/PhysRevB.71.012405
Experimental evidence of the d-f Coulomb interaction responsible for the resonant x-ray scattering (RXS) from antiferroquadrupolar order in DyB2C2 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' but the opposite sign for sigma-sigma' channel. This result, when compared with the calculated structure factors, means that the quadrupolar moments of the 4f and 5d electrons have opposite signs to each other. Interference between nonresonant Thomson scattering from the lattice distortion and the resonant scatterings is also studied and a direct coupling between 4f and the lattice is concluded.
Hirota Kaoru
Matsumura Takanori
Murakami Yoichi
Nakao Hironori
Okuyama Daisuke
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