Publications by Roger Johnson


Resonant x-ray scattering from the 4p quadrupole moment in YVO3

Physical Review B - Condensed Matter and Materials Physics 82 (2010)

TAW Beale, RD Johnson, Y Joly, SR Bland, PD Hatton, L Bouchenoire, C Mazzoli, D Prabhakaran, AT Boothroyd

We show that resonant scattering signals at the Bragg forbidden positions in YVO3 originate from the anisotropic nature of the atomic scattering factor. The E1-E1 scattering from the electric-quadrupole moment is explained entirely through the crystal structure and does not require sensitivity to 3d orbital order. Simulations of the resonance using the FDMNES code suggest that the Jahn-Teller distortion provides an insignificant contribution to the intensity of the forbidden reflection. Thus we show that resonant x-ray diffraction at the vanadium K -edge in YVO3 is largely insensitive, even indirectly, to 3d orbital order through Jahn-Teller distortions. © 2010 The American Physical Society.


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