Spin Seebeck effect in quantum magnet Pb₂V₃O₉

Spin Seebeck effect, the generation of spin current from heat, has been extensively studied in a large variety of magnetic materials, including ferromagnets, antiferromagnets, paramagnets, and quantum spin liquids. In this paper, we report the study of the Spin Seebeck effect in the single crystalline Pb₂V₃O₉, a typical spin-gapped quantum magnet with quasi-one-dimensional spin-1/2 chain. Detailed temperature and magnetic field dependences of the Spin Seebeck effect are investigated, and the temperature-dependent critical magnetic fields show a strong correlation to the Bose-Einstein condensation phase of the quantum magnet Pb₂V₃O₉. This work shows the potential of using spin current as a probe to study the spin correlation and phase transition properties in quantum magnets.