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2016 ; 72
(Pt 2
): 197-205
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On the possibility of using X-ray Compton scattering to study magnetoelectrical
properties of crystals
#MMPMID26919371
Collins SP
; Laundy D
; Connolley T
; van der Laan G
; Fabrizi F
; Janssen O
; Cooper MJ
; Ebert H
; Mankovsky S
Acta Crystallogr A Found Adv
2016[Mar]; 72
(Pt 2
): 197-205
PMID26919371
show ga
This paper discusses the possibility of using Compton scattering--an inelastic
X-ray scattering process that yields a projection of the electron momentum
density--to probe magnetoelectrical properties. It is shown that an antisymmetric
component of the momentum density is a unique fingerprint of such time- and
parity-odd physics. It is argued that polar ferromagnets are ideal candidates to
demonstrate this phenomenon and the first experimental results are shown, on a
single-domain crystal of GaFeO3. The measured antisymmetric Compton profile is
very small (? 10(-5) of the symmetric part) and of the same order of magnitude as
the statistical errors. Relativistic first-principles simulations of the
antisymmetric Compton profile are presented and it is shown that, while the
effect is indeed predicted by theory, and scales with the size of the valence
spin-orbit interaction, its magnitude is significantly overestimated. The paper
outlines some important constraints on the properties of the antisymmetric
Compton profile arising from the underlying crystallographic symmetry of the
sample.