2015/01/11 by S W Lovesey, S. W. Lovesey, D. D. Khalyavin +4 · 1 citation
Arts and Humanities · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties and Applications #Medieval European Literature and History #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1501.02427
arXiv admin note: text overlap with arXiv:1408.5562
arxiv created 2015/01/11 · openalex publication_date 2015/01/11 · arxiv updated 2015/05/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
A theory that fully describes previously observed neutron Bragg spots indicative of magnetic order in the pseudo-gap phase of YBa2Cu3O6 + x is presented. Magnetic diffraction intensities, unveiled by polarization analysis, are explained by parity-violating magnetic (magneto-electric) quadrupoles at in-plane Cu sites arranged in a simple ferro-type motif. An absence of conventional spin and orbital angular momentum dipoles in the theory is compatible with the occurrence of superconductivity and strongly suggests, moreover, that magneto-electric quadrupoles are the primary order-parameter in the pseudo-gap phase.