Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce$_2$Hf$_2$O$_7$

Autor:	Porée, Victor, Bhardwaj, Anish, Lhotel, Elsa, Petit, Sylvain, Gauthier, Nicolas, Yan, Han, Pomjakushin, Vladimir, Ollivier, Jacques, Quilliam, Jeffrey A., Nevidomskyy, Andriy H., Changlani, Hitesh J., Sibille, Romain
Rok vydání:	2023
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	We investigate the correlated state of Ce$_2$Hf$_2$O$_7$ using neutron scattering, finding signatures of correlations of both dipolar and octupolar character. A dipolar inelastic signal is also observed, as expected for spinons in a quantum spin ice (QSI). Fits of thermodynamic data using exact diagonalization methods indicate that the largest interaction is an octupolar exchange, with a strength roughly twice as large as other terms. A hierarchy of exchange interactions with dominant octupolar and significant dipolar exchange, still in the octupolar QSI phase, rationalises neutron scattering observations. Our results reveal a `quantum multipolar liquid' where correlations involve multiple terms in moment series expansion, opening questions about their intertwining and possible hierarchy. Comment: 6 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2305.08261 Zobrazit plný text záznamu View this record from Arxiv