Intermultiplet transitions and magnetic long-range order in Sm-based pyrochlores

Abstract

We present bulk and neutron scattering measurements performed on the isotopically enriched ${}^{154}\mathrm{S}{\mathrm{m}}_2\mathrm{T}{\mathrm{i}}_2{\mathrm{O}}_7$ and ${}^{154}\mathrm{S}{\mathrm{m}}_2\mathrm{S}{\mathrm{n}}_2{\mathrm{O}}_7$ samples. Both compounds display sharp heat capacity anomalies, at 350 mK and 440 mK, respectively. Inelastic neutron scattering measurements are employed to determine the crystalline electric field (CEF) level scheme, which includes transitions between the ground-state and first excited $J$ multiplets of the ${\mathrm{Sm}}^{3+}$ ion. To further validate those results, the single-ion magnetic susceptibility of the compounds is calculated and compared with the experimental DC-susceptibility measured in low applied magnetic fields. It is demonstrated that the inclusion of intermultiplet transitions in the CEF analysis is fundamental to the understanding of the intermediate and, more importantly, low temperature magnetic behaviour of the Sm-based pyrochlores. Finally, the heat capacity anomaly is shown to correspond to the onset of an all-in-all-out long-range order in the stannate sample, while in the titanate a dipolar long-range order can be only indirectly inferred.

arXiv comment13 pages, 10 Figures

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• Hierarchy of energy scales and field-tunable order by disorder in dipolar-octupolar pyrochlores
• Ordered ground states of kagome magnets with generic exchange anisotropy
• Magnetotransport of single crystal Sm${}_2$Ir${}_2$O${}_7$ across the pressure-induced quantum-critical phase boundary
• Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family
• Analytic description of spin waves in dipolar/octupolar pyrochlore magnets