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Identifying and characterizing new magnetic systems with Co2+ ions canenhance our understanding of quantum behavior since Co2+ can host apseudospin-1/2 magnetic ground state. Understanding the magnetic ground stateand the phase diagrams of such systems are central to the development of newtheoretical models to described emergent quantum properties of complex magneticsystems. The sawtooth chain compound, CsCo2MoO4_2OH, is one such complexmagnetic system and here, we present a comprehensive series of magnetic andneutron scattering measurements to determine its magnetic phase diagram. Themagnetic properties of CsCo2MoO4_2OH exhibit a strong coupling to the crystallattice and its magnetic ground state can be easily manipulated by appliedmagnetic fields. There are two unique Co2+ ions, base and vertex, with Jbb andJbv magnetic exchange. The magnetism is highly anisotropic with the b-axis(chain) along the easy axis and the material orders antiferromagnetically at TN= 5 K. The zero field antiferromagnetic phase contains vertex magnetic vectorsCo1 aligned parallel to the b-axis, while the base vectors Co2 are canted by 34and aligned in an opposite direction to the vertex vectors. The spins inparallel adjacent chains align in opposite directions, creating an overallantiferromagnetic structure. At a 3 kOe applied magnetic field, adjacent chainsflip by 180{\deg} to generate a ferrimagnetic phase. An increase in fieldgradually induces the Co(1) moment to rotate along the b-axis and align in thesame direction with Co2 generating a ferromagnetic structure. Our resultsdemonstrate that the CsCo2MoO4_2OH is a promising candidate to study newphysics associated with sawtooth chain magnetism.

Field Tunable Magnetic Transitions of CsCo2(MoO4)2(OH): A Triangular Chain Structure with a Frustrated Geometry