Magnetic Field Induced Phases of the Strontium Ruthenates

Magnetic-field- and temperature-dependent Raman scattering has been used to investigate the magnetic-field-induced structural and magnetic phases of the triple-layer ruthenate system Sr$_{4}$Ru$_{3}$O$_{10}$ (Sr4310), which is a low temperature ferromagnet with T$_{C }$= 105 K. Magnetic-field-induced changes in the phonon spectra reveal dramatic spin-reorientation transitions and strong magnetoelastic coupling in this material. Further, the highly anisotropic field-induced effects observed for magnetic fields along the c-axis (magnetic easy axis) and ab-plane provide insight into the complex magnetic and structural (H,T) phase diagram of this material. We compare our magnetic-field dependent Raman results in Sr4310 with those of the quantum-critical bilayer material Sr$_{3}$Ru$_{2}$O$_{7}$, as well as with magnetic and transport measurements of Sr4310.