Spin Seebeck measurements in a frustrated magnetic system

Frustrated magnetic systems and quantum spin liquid candidates can have complex magnetic phase diagrams as a function of temperature and field, due to the competition between different ordered and disordered states. Phase boundaries are typically detected through detailed measurements of inelastic neutron scattering, magnetization or magnetic susceptibility, and thermodynamic quantities like specific heat. Local spin Seebeck effect measurements are an electrically driven, electrically detected method that is sensitive to the low energy spin-carrying excitations in magnetic systems, and thus is another approach for transitions between different magnetic phases. We present initial measurements of the spin Seebeck effect in devices patterned on the surface of single crystals of BaCo2(AsO4)2 as a function of field and temperature. We discuss the signals observed in the context of the rich magnetic phase diagram for this system below 10 K.