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Recently, Yb-based triangular lattice antiferromagnets have garneredsignificant interest as possible quantum spin liquid candidates. One example isYbMgGaO4, which showed many promising spin liquid features, but also possessesa high degree of disorder owing to site-mixing between the non-magneticcations. To further elucidate the role of chemical disorder and to explore thephase diagram of these materials in applied field, we present neutronscattering and sensitive magnetometry measurements of the closely relatedcompound, YbZnGaO4. Our results suggest a difference in magnetic anisotropybetween the two compounds, and we use key observations of the magnetic phasecrossover to motivate an exploration of the field- and exchangeparameter-dependent phase diagram, providing an expanded view of the availablemagnetic states in applied field. This enriched map of the phase space servesas a basis to restrict the values of parameters describing the magneticHamiltonian with broad application to recently discovered related materials.

Phase Diagram of YbZnGaO4 in Applied Magnetic Field