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Over the past two decades, the magnetic ground states of all rare earthtitanate pyrochlores have been extensively studied, with the exception ofSm$_2$Ti$_2$O$_7$. This is, in large part, due to the very high absorptioncross-section of naturally-occurring samarium, which renders neutron scatteringinfeasible. To combat this, we have grown a large, isotopically-enriched singlecrystal of Sm$_2$Ti$_2$O$_7$. Using inelastic neutron scattering, we determinethat the crystal field ground state for Sm$^{3+}$ is a dipolar-octupolardoublet with Ising anisotropy. Neutron diffraction experiments reveal thatSm$_2$Ti$_2$O$_7$ orders into the all-in, all-out magnetic structure with anordered moment of 0.44(7) $\mu_B$ below $T_N=0.35$ K, consistent withexpectations for antiferromagnetically-coupled Ising spins on the pyrochlorelattice. Zero-field muon spin relaxation measurements reveal an absence ofspontaneous oscillations and persistent spin fluctuations down to 0.03 K. Thecombination of the dipolar-octupolar nature of the Sm$^{3+}$ moment, theall-in, all-out ordered state, and the low-temperature persistent spin dynamicsmake this material an intriguing candidate for moment fragmentation physics.

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