Anapole correlations in Sr2IrO4 defy the jeff=1/2 model

Autor:	S. W. Lovesey, D. D. Khalyavin
Rok vydání:	2019
Předmět:	Physics Diffraction Quantum mechanics Neutron diffraction Degrees of freedom (physics and chemistry) Quantum entanglement Ground state Space (mathematics) Symmetry (physics) Spin-½
Zdroj:	Physical Review B. 100
ISSN:	2469-9969 2469-9950
DOI:	10.1103/physrevb.100.224415
Popis:	Zel'dovich (spin) anapole correlations in $\mathrm{S}{\mathrm{r}}_{2}\mathrm{Ir}{\mathrm{O}}_{4}$ unveiled by magnetic neutron diffraction contravene the spin-orbit coupled ground state used by the ${j}_{\mathrm{eff}}=1/2$ (pseudospin) model. Specifically, spin and space know inextricable knots which bind each to the other in the iridate. The diffraction property studied in the paper is enforced by strict requirements from quantum mechanics and magnetic symmetry. It has not been exploited in the past, whereas neutron diffraction by anapole moments is established. Entanglement of the electronic degrees of freedom is captured by dyadic correlations of the anapole and position operators, and hallmarked in the diffraction amplitude by axial atomic multipoles with an even rank.
Databáze:	OpenAIRE
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