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In this work, we investigate the local structural distortion of the doubleperovskite Ba$_2$YMoO$_6$ by means of infrared transmission spectroscopy. At300 K, three bands are observed at $\sim$ 255.1 cm$^{-1}$, $\sim$ 343.4cm$^{-1}$, and $\sim$ 561.5 cm$^{-1}$, which are related to the motion betweenthe cation Ba$^{2+}$ and the anion YMO$_6^{-2}$, the Y-O stretching motion andthe stretching vibration of the MoO$_6$ octahedron, respectively. These modescontinue to harden upon cooling owing to the shrink of the lattice constant.When the temperature decreases to $T \leq$ 130 K around which the spin singletdimer begins to form, an additional phonon mode appears at $\sim$ 611cm$^{-1}$, suggesting the occurrence of local distortion of MoO$_6$ octahedra.With further decrease of the temperature, its intensity enhances and its peakposition keeps unchanged. These results indicate that the formation of the spinsinglet dimers is accompanied with the occurrence of the local structuredistortion of MoO$_6$ octahedra, providing evidence for the strong spin-phononcoupling in the double perovskite Ba$_2$YMoO$_6$.

Spin-phonon coupling probed by infrared transmission spectroscopy in the double perovskite Ba$_2$YMoO$_6$