TL;DR
This paper re-examines an ancient electron Hamiltonian as a model for magneto-electric multipoles, showing it aligns well with neutron diffraction data on YBCO, especially after including crystal-field effects.
Contribution
It introduces a refined model linking entangled spin and orbital degrees of freedom to magneto-electric multipoles, matching experimental data more accurately.
Findings
Magneto-electric multipoles closely match neutron diffraction data.
Adding crystal-field potential improves model-data agreement.
Model suggests magnetic charge and quantum rotator are tightly coupled.
Abstract
An ancient Hamiltonian of electrons with entangled spin and orbital degrees of freedom is re-examined as a model of magneto-electric multipoles. In the model, a magnetic charge and simple quantum rotator are tightly locked in action, some might say they are enslaved entities. It is shown that magneto-electric multipoles almost perfectly accord with those inferred from an analysis of magnetic neutron diffraction data on a ceramic superconductor (YBCO) in the pseudo-gap phase. Nigh on perfection between Stone's model and inferred magneto-electric multipoles is achieved by addition to the original model of a crystal-field potential appropriate for the magnetic space-group used in the published data analysis
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