Cubic double perovskites that host heavy ions with total angular momentum J = 2 can exhibit a singular magnetic state epitomized by a lone octupole and bulk ferro-type magnetism. It exists in the Chen - Balents Hamiltonian with a quadrupole interaction and competing exchange forces between the ions. Our symmetry inspired analysis mirrors the Dzyaloshinskii - Man'ko theory of latent antiferromagnetic ordering, and a 3-k collinear structure. Experimental tests of the singular state include neutron and x-ray Bragg diffraction.
@article{arxiv.2004.13325,
title = {Lone octupole and bulk magnetism in osmate 5d2 double perovskites},
author = {S. W. Lovesey and D. D. Khalyavin},
journal= {arXiv preprint arXiv:2004.13325},
year = {2020}
}