  We have investigated the magnetic-field- and pressure-induced structural and
magnetic phases of the triple-layer ruthenate - Sr$_{4}$Ru$_{3}$O$_{10}$.
Magnetic-field-induced changes in the phonon spectra reveal dramatic
spin-reorientation transitions and strong magneto-elastic coupling in this
material. Additionally, pressure-dependent Raman measurements at different
temperatures reveal an anomalous negative Gruneisen-parameter associated with
the B$_{1g}$ mode ($\sim$ 380 cm$^{-1}$) at low temperatures (T $<$ 75K), which
can be explained consistently with the field dependent Raman data.
