Dipolar-Octupolar Ising Antiferromagnetism in Sm${}_2$Ti${}_2$O${}_7$: A Moment Fragmentation Candidate

Abstract

Over the past two decades, the magnetic ground states of all rare earth titanate pyrochlores have been extensively studied, with the exception of Sm${}_2$Ti${}_2$O${}_7$. This is, in large part, due to the very high absorption cross-section of naturally-occurring samarium, which renders neutron scattering infeasible. To combat this, we have grown a large, isotopically-enriched single crystal of Sm${}_2$Ti${}_2$O${}_7$. Using inelastic neutron scattering, we determine that the crystal field ground state for Sm${}^{3+}$ is a dipolar-octupolar doublet with Ising anisotropy. Neutron diffraction experiments reveal that Sm${}_2$Ti${}_2$O${}_7$ orders into the all-in, all-out magnetic structure with an ordered moment of 0.44(7) ${\mu }_B$ below $T_N=0.35$ K, consistent with expectations for antiferromagnetically-coupled Ising spins on the pyrochlore lattice. Zero-field muon spin relaxation measurements reveal an absence of spontaneous oscillations and persistent spin fluctuations down to 0.03 K. The combination of the dipolar-octupolar nature of the Sm${}^{3+}$ moment, the all-in, all-out ordered state, and the low-temperature persistent spin dynamics make this material an intriguing candidate for moment fragmentation physics.

arXiv comment5 pages, 4 figures. Supplemental Material

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• Evaluating the Effects of Structural Disorder on the Magnetic Properties of Nd${}_2$Zr${}_2$O${}_7$
• Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family
• Magnetic transition in the $J_{\text{eff}}=1/2$ Kagomé system Sm${}_3$Sb${}_3$Zn${}_2$O${}_{14}$
• Synthesis and characterization of the novel breathing pyrochlore compound Ba3Tm2Zn5O11
• Analytic description of spin waves in dipolar/octupolar pyrochlore magnets