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Pré-Publication, Document De Travail Année : 2023

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

Résumé

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. This hierarchy of exchange interactions - far from a perturbative regime but still in the octupolar QSI phase - rationalises observations in neutron scattering, which illustrate the multipolar nature of degrees of freedom in Ce$^{3+}$ pyrochlores.

Dates et versions

hal-04225181 , version 1 (02-10-2023)

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Victor Porée, Anish Bhardwaj, Elsa Lhotel, Vladimir Pomjakushin, Sylvain Petit, et al.. Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce$_2$Hf$_2$O$_7$. 2023. ⟨hal-04225181⟩
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