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We present a systematic study of the structure and lattice dynamics at roomtemperature, and the phonon behavior at low temperatures in orthorhombicGd$_{1-x}$Y$_{x}$MnO$_{3}$ manganites, with 0 $\leq$ x $\leq$ 0.4, using powderx-ray diffraction and Raman scattering. A thorough analysis towards thecorrelation between both structural and Raman modes parameters was undertaken.The data obtained at room temperature reveal structural distortions arisingfrom the Jahn-Teller distortion and octahedra tilting. The Jahn-Tellerdistortion is apparently x-independent, while an increase of Mn-O1-Mn bondangle of about 0.5{\deg} could be ascertain when x changes from 0 to 0.4.Spin-phonon coupling was evidenced from the Raman results. The temperaturedependence of the B1g in-plane O2 stretching mode of the MnO6 octahedron hasrevealed either a positive or negative shift regarding the pure anharmonictemperature dependence of the phonon frequency, which strongly depends on theY-concentration. The frequency renormalization is explained in terms of acompetition between ferro and antiferromagnetic interactions. The ratio betweenthe spin-phonon coupling constant and the effective magnetic exchange integralper spin was determined from the renormalized wave number of the in-plane O2stretching mode, associated with the spin-spin correlation function.

Structural properties and spin-phonon coupling in orthorhombic Y-substituted GdMnO$_{3}$