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Sharp structures in magnetic field-dependent spin Seebeck effect (SSE) voltages of Pt/Y_3Fe_5O_12 (YIG) at low temperatures are attributed to the magnon-phonon interaction. Experimental results are well reproduced by a Boltzmann theory that includes the magnetoelastic coupling (MEC). The SSE anomalies coincide with magnetic fields tuned to the threshold of magnon-polaron formation. The effect gives insight into the relative quality of the lattice and magnetization dynamics.doi:10.1103/physrevlett.117.207203 pmid:27886475 fatcat:2vtflshzfrcpddjlf7f5imo554