Rods of Neutron Scattering Intensity in Yb2Ti2O7: Compelling Evidence for Significant Anisotropic Exchange in a Magnetic Pyrochlore Oxide

TL;DR

This study uses neutron scattering to reveal a rod of magnetic scattering in Yb2Ti2O7, providing strong evidence for significant anisotropic exchange interactions in this insulating pyrochlore oxide.

Contribution

The paper develops a model Hamiltonian incorporating all symmetry-allowed exchange and dipolar interactions, accurately describing the neutron scattering data.

Findings

Identification of a [111] rod of scattering intensity

Evidence for significant anisotropic exchange interactions

Model successfully reproduces experimental scattering patterns

Abstract

Paramagnetic correlations in the magnetic material Yb2Ti2O7 have been investigated via neutron scattering, revealing a [111] rod of scattering intensity. Assuming interactions between the Yb^{3+} ions composed of all symmetry-allowed nearest neighbor exchange interactions and long-range dipolar interactions, we construct a model Hamiltonian that allows for an excellent description of the neutron scattering data. Our results provide compelling evidence for significant anisotropic exchange interactions in an insulating magnetic pyrochlore oxide. We also compute the real space correlations leading to the [111] rod of scattering.